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Ashcroftine-(Y)

A valid IMA mineral species - grandfathered

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Photos of Ashcroftine-(Y) (29)

Ashcroftine-(Y) Gallery Search Photos of Ashcroftine-(Y)

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Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Ashcroftine-(Y)

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

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About Ashcroftine-(Y)Hide

Frederick Noel Ashcroft

Formula:

K₅Na₅(Y,Ca)₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O

Colour:

Pink

Lustre:

Sub-Vitreous, Waxy, Silky

Hardness:

Specific Gravity:

2.61

Crystal System:

Tetragonal

Name:

Named by Max Hutchinson Hey and Frederick Allen Bannister in honor of Frederick Noel Ashcroft [August 28, 1878 Wavertree, near Liverpool, United Kingdom - April 4, 1949 London, United Kingdom], well known British mineral collector.

Named as kalithomsonite in 1932 by S. G. Gordon, for its resemblance to thomsonite and its potassium content. Later Hey & Bannister (1933) showed that the mineral has no close relationship to thomsonite and gave it the name ashcroftine. The suffix was added in 1987 by the IMA to denote the dominant REE.

Type Locality:

ⓘ Narssârssuk pegmatite, Narsaarsuk Plateau, Igaliku, Kujalleq, Greenland

Unique IdentifiersHide

Mindat ID:

389

Long-form identifier:

mindat:1:1:389:0

GUID
(UUID V4):

c988a40f-b8a0-4a45-9a8e-e0906fa079e2

IMA Classification of Ashcroftine-(Y)Hide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

IMA status notes:

Renamed by the IMA

IMA Formula:

K₅Na₅Y₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O

Classification of Ashcroftine-(Y)Hide

Strunz-mindat (2024):

9.DN.15

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains

Dana 8th ed.:

70.3.1.1

70 : INOSILICATES Column or Tube Structures
3 : Column or Tube Structures with balo-silicates

Hey's CIM Ref.:

14.8.9

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Acf-Y	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Ashcroftine-(Y)Hide

Lustre:

Sub-Vitreous, Waxy, Silky

Transparency:

Transparent

Colour:

Pink

Streak:

White

Hardness:

5 on Mohs scale

Tenacity:

Brittle

Cleavage:

Perfect
{100}, also {001} good

Fracture:

Irregular/Uneven

Density:

2.61 g/cm³ (Measured) 2.60 g/cm³ (Calculated)

Optical Data of Ashcroftine-(Y)Hide

Type:

Uniaxial (+)

RI values:

n_ω = 1.536 - 1.537 n_ε = 1.545 - 1.549

Birefringence:

0.010

Max Birefringence:

δ = 0.009

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Low

Optical Extinction:

Parallel

Pleochroism:

Non-pleochroic

Chemistry of Ashcroftine-(Y)Hide

Mindat Formula:

K₅Na₅(Y,Ca)₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O

Elements listed:

C, Ca, H, K, Na, O, Si, Y - search for minerals with similar chemistry

Crystallography of Ashcroftine-(Y)Hide

Crystal System:

Tetragonal

Class (H-M):

4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal

Space Group:

I4/mmm

Cell Parameters:

a = 23.99 Å, c = 17.51 Å

Ratio:

a:c = 1 : 0.73

Unit Cell V:

10,077.36 Å³ (Calculated from Unit Cell)

Morphology:

Acicular, rod-like

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0001129	Ashcroftine-(Y)	Moore P B, Sen Gupta P K, Schlemper E O, Merlino S (1987) Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140).16H2O, a structure with enormous polyanions American Mineralogist 72 1176-1189		1987		0	293
0001130	Ashcroftine-(Y)	Moore P B, Sen Gupta P K, Schlemper E O, Merlino S (1987) Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140).16H2O, a structure with enormous polyanions American Mineralogist 72 1176-1189		1987		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Ashcroftine-(Y)'
loop_
_publ_author_name
'Moore P B'
'Sen Gupta P K'
'Schlemper E O'
'Merlino S'
_journal_name_full 'American Mineralogist'
_journal_volume 72 
_journal_year 1987
_journal_page_first 1176
_journal_page_last 1189
_publ_section_title
;
 Ashcroftine, ca. K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140).16H2O, a
 structure with enormous polyanions
 Sample: investigated by Moore, Sen Gupta, Schlemper
;
_database_code_amcsd 0001129
_chemical_formula_sum 'Si54.16 O202.96 C16 Y24 K10.4 Na8.26 H14.8'
_cell_length_a 23.994
_cell_length_b 23.994
_cell_length_c 17.512
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 10081.868
_exptl_crystal_density_diffrn      2.538
_symmetry_space_group_name_H-M 'I 4/m m m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '-y,-x,z'
  '1/2-y,1/2-x,1/2+z'
  'y,x,-z'
  '1/2+y,1/2+x,1/2-z'
  'y,-x,-z'
  '1/2+y,1/2-x,1/2-z'
  '-y,x,z'
  '1/2-y,1/2+x,1/2+z'
  'x,-y,z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  'x,y,-z'
  '1/2+x,1/2+y,1/2-z'
  '-x,-y,z'
  '1/2-x,1/2-y,1/2+z'
  'y,x,z'
  '1/2+y,1/2+x,1/2+z'
  '-y,-x,-z'
  '1/2-y,1/2-x,1/2-z'
  '-y,x,-z'
  '1/2-y,1/2+x,1/2-z'
  'y,-x,z'
  '1/2+y,1/2-x,1/2+z'
  '-x,y,z'
  '1/2-x,1/2+y,1/2+z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Si1   0.24140   0.15100   0.41280   1.00000
Si2   0.26970   0.06350   0.29450   1.00000
Si3   0.21880   0.06300   0.13390   1.00000
O1   0.23710   0.09350   0.36440   1.00000
O2   0.22350   0.06190   0.22640   1.00000
O3   0.30180   0.17800   0.40340   1.00000
O4   0.26820   0.09700   0.09580   1.00000
O5   0.32470   0.09580   0.26950   1.00000
O6   0.15950   0.08750   0.11600   1.00000
O7   0.19120   0.19120   0.38480   1.00000
O8   0.22970   0.13220   0.50000   1.00000
O9   0.28070   0.00000   0.32050   1.00000
O10   0.22000   0.00000   0.10330   1.00000
C1   0.40020   0.00000   0.15820   1.00000
O11   0.42610   0.04690   0.17130   1.00000
O12   0.35290   0.00000   0.13150   1.00000
C2   0.37090   0.09230   0.50000   1.00000
O13   0.35960   0.06930   0.43530   1.00000
O14   0.39320   0.14110   0.50000   1.00000
O-H1   0.24730   0.24730   0.50000   1.00000
OW1   0.12640   0.12640   0.27820   1.00000
OW2   0.50000   0.00000   0.00000   1.00000
Y1   0.35560   0.11520   0.14680   1.00000
Y2   0.26790   0.16180   0.00000   1.00000
K1   0.27040   0.00000   0.50000   1.00000
K2   0.30570   0.00000   0.00000   1.00000
Na1   0.50000   0.00000   0.25000   1.00000
SiT1D   0.13360   0.13360   0.06220   0.38000
SiT2D   0.09860   0.09860   0.09050   0.39000
K1D   0.21580   0.21580   0.20570   0.30000
Na1D   0.41810   0.00000   0.39240   0.45000
Na2D   0.39000   0.00000   0.35850   0.28000
Na3D   0.00000   0.00000   0.00000   0.42000
O-H1D   0.18590   0.18590   0.07720   0.49000
O-H2D   0.05320   0.05320   0.12700   0.30000
O-H3D   0.14410   0.10860   0.00000   0.13000
O4D   0.09830   0.09830   0.00000   0.54000
O-H5D   0.10360   0.00000   0.00000   0.36000
O-H6D   0.17330   0.17330   0.00000   0.50000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si1 0.02290 0.00960 0.00800 0.00260 -0.00090 -0.00310
Si2 0.03770 0.00840 0.01010 -0.00280 0.00600 -0.00190
Si3 0.03200 0.00970 0.01330 -0.00130 0.00010 0.00050
O1 0.04670 0.02070 0.01000 -0.00100 0.01240 -0.01320
O2 0.04080 0.02750 0.01020 -0.00610 0.00190 -0.00170
O3 0.01720 0.01990 0.02460 0.00790 0.00020 -0.00740
O4 0.02660 0.01840 0.02020 0.00120 -0.00140 0.00490
O5 0.02560 0.01900 0.01730 -0.00500 0.00840 -0.00240
O6 0.02120 0.05190 0.08820 0.00700 -0.00760 0.02960
O7 0.01920 0.01920 0.00210 0.01350 -0.00620 -0.00620
O8 0.04850 0.01230 0.00560 -0.07800 0.00000 0.00000
O9 0.04900 0.00860 0.02010 0.00000 0.00390 0.00000
O10 0.08840 0.00490 0.01540 0.00000 -0.00210 0.00000
C1 0.02460 0.06600 0.04280 0.00000 -0.00400 0.00000
O11 0.04460 0.04350 0.06270 0.00040 0.00240 0.00030
O12 0.02880 0.15790 0.04230 0.00000 -0.01350 0.00000
C2 0.04990 0.05970 0.02190 0.02170 0.00000 0.00000
O13 0.05010 0.02820 0.01480 0.00830 -0.00530 -0.00360
O14 0.03560 0.02290 0.02450 -0.01010 0.00000 0.00000
O-H1 0.00830 0.00830 0.00050 0.00180 0.00000 0.00000
OW1 0.09040 0.09040 0.03280 0.06970 -0.04170 -0.04170
OW2 0.03450 0.03800 0.01780 0.00000 0.00000 0.00000
Y1 0.01670 0.02770 0.01130 0.00520 0.00000 0.00350
Y2 0.01810 0.01490 0.01140 0.00030 0.00000 0.00000
K1 0.04930 0.08540 0.04280 0.00000 0.00000 0.00000
K2 0.06620 0.06690 0.04110 0.00000 0.00000 0.00000
Na1 0.02580 0.02580 0.06790 0.00000 0.00000 0.00000
SiT1D 0.00370 0.00370 0.00130 0.00020 0.01460 0.01460
SiT2D 0.01340 0.01340 0.00710 -0.00740 -0.00320 -0.00320
K1D 0.15100 0.15100 0.09630 -0.06650 -0.00140 -0.00140
Na1D 0.02950 0.02360 0.05580 0.00000 0.00690 0.00000
Na2D 0.04960 0.00010 0.06180 0.00000 0.02010 0.00000
Na3D -0.03130 -0.03130 0.72570 0.00000 0.00000 0.00000
O-H1D 0.02860 0.02860 0.06630 -0.00490 0.03070 0.03070
O-H2D 0.03440 0.03440 0.03530 -0.05060 0.00540 0.00540
O-H3D 0.00010 0.01670 0.00010 -0.00470 0.00000 0.00000
O4D 0.04960 0.04960 0.00010 -0.02800 0.00000 0.00000
O-H5D 0.04290 0.00220 0.13540 0.00000 0.00000 0.00000
O-H6D 0.02220 0.02220 0.15460 0.00480 0.00000 0.00000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
17.00 Å	(100)
12.0 Å	(90)
7.62 Å	(60)
7.10 Å	(20)
6.01 Å	(30)
5.38 Å	(30)
3.11 Å	(50)
2.69 Å	(50)

Comments:

22-508

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of Ashcroftine-(Y)Hide

Type Locality:

ⓘ Narssârssuk pegmatite, Narsaarsuk Plateau, Igaliku, Kujalleq, Greenland

Place of Conservation of Type Material:

The Natural History Museum, London, England, 1924,867.
University of Copenhagen, Copenhagen, Denmark.
Harvard University, Cambridge, Massachusetts, USA, 110266.
National Museum of Natural History, Washington, D.C., USA, 95320, R4333.

Synonyms of Ashcroftine-(Y)Hide

Kalithomsonite

Other Language Names for Ashcroftine-(Y)Hide

German:Ashcroftin-(Y)

Russian:Ашкрофтин

Common AssociatesHide

Associated Minerals Based on Photo Data:

8 photos of Ashcroftine-(Y) associated with Calcite	CaCO₃
3 photos of Ashcroftine-(Y) associated with Fluorite	CaF₂
3 photos of Ashcroftine-(Y) associated with Elpidite	Na₂ZrSi₆O₁₅ · 3H₂O
2 photos of Ashcroftine-(Y) associated with Aegirine	NaFe³⁺Si₂O₆
2 photos of Ashcroftine-(Y) associated with Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
1 photo of Ashcroftine-(Y) associated with Graphite	C

Related Minerals - Strunz-mindat Grouping Hide

9.DN.	Letnikovite-(Ce)	(Na◻)Ca₂Ce₂[Si₇O₁₇(OH)]F₄(H₂O)₄	Mon. 2/m : B2/m
9.DN.05	Emeleusite	Li₂Na₄Fe₂Si₁₂O₃₀	Orth. mmm (2/m 2/m 2/m)
9.DN.05	Tuhualite	NaFe²⁺Fe³⁺Si₆O₁₅	Orth. mmm (2/m 2/m 2/m) : Cmca
9.DN.05	Zektzerite	LiNaZrSi₆O₁₅	Orth. mmm (2/m 2/m 2/m) : Cmca
9.DN.10	Semenovite-(Ce)	Na₈Ca₂FeBe₆Ce₂Si₁₄O₄₀(OH)₄F₄	Orth. mmm (2/m 2/m 2/m)
9.DN.15	Ashcroftine-(Ce)	K₅Na₅(Ce,Ca)₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O	Tet.

Fluorescence of Ashcroftine-(Y)Hide

In UV light:

Not fluorescent.

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Ashcroftine-(Y)Hide

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https://www.mindat.org/min-389.html
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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for Ashcroftine-(Y)Hide

Reference List:

Hey, Max H., Bannister, F. A. (1933) Studies on the zeolites. Part IV. Ashcroftine (kalithomsonite of S. G. Gordon) Mineralogical Magazine and Journal of the Mineralogical Society, 23 (140) 305-308 doi:10.1180/minmag.1933.023.140.02

Moore, P. B., Bennett, J. M., Louisnathan, S. J. (1969) Ashcroftine is not a zeolite!. Mineralogical Magazine, 37 (288) 515-517 doi:10.1180/minmag.1969.037.288.12

Fleischer, M., Nickel, E.H. (1970): New mineral names. American Mineralogist, 55, 1810-1818.

Nickel, Ernest H., Mandarino, Joseph A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist, 72 (9-10) 1031-1042

Moore, P.B., Sen Gupta, P.K., Schlemper, E.O., and Merlino, S.(1987): Ashcroftine, K10Na10(Y,Ca)24(OH)4(CO3)16(Si56O140)·16H2O, a structure with enormous polyanions. American Mineralogist, 72, 1176-1189.

Petersen, Ole V., Johnsen, Ole (2005) Mineral species first described from Greenland - Special Publication No. 8. The Canadian Mineralogist. p.1-184.

(2023) Ashcroftine-(Y) Handbook of Mineralogy. Mineralogical Society of America

Localities for Ashcroftine-(Y)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Canada
Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)	166-175. +2 other references

Greenland (TL)
Kujalleq Igaliku Narsaarsuk Plateau ⓘ Narssârssuk pegmatite (TL)	Nature (1932) +2 other references

Italy
Lazio Metropolitan City of Rome Capital Rome Osteria dell'Osa ⓘ ~~Osa Quarry~~	forum.amiminerals.it (n.d.) +2 other references

Ashcroftine-(Y)

About Ashcroftine-(Y)Hide

Unique IdentifiersHide

IMA Classification of Ashcroftine-(Y)Hide

Classification of Ashcroftine-(Y)Hide

Mineral SymbolsHide

Physical Properties of Ashcroftine-(Y)Hide

Optical Data of Ashcroftine-(Y)Hide

Chemistry of Ashcroftine-(Y)Hide

Crystallography of Ashcroftine-(Y)Hide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of Ashcroftine-(Y)Hide

Synonyms of Ashcroftine-(Y)Hide

Other Language Names for Ashcroftine-(Y)Hide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of Ashcroftine-(Y)Hide

Other InformationHide

Internet Links for Ashcroftine-(Y)Hide

References for Ashcroftine-(Y)Hide

Localities for Ashcroftine-(Y)Hide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide