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Holtstamite

A valid IMA mineral species

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Photos of Holtstamite (5)

Holtstamite Gallery Search Photos of Holtstamite

Edit Add Synonym Edit CIF structures Clear Cache

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

Holtstamite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

Holtstamite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

Holtstamite

Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco

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About HoltstamiteHide

Dan Holtstam

Formula:

Ca₃Al₂(SiO₄)₂[◻(OH)₄]

Colour:

Brownish-yellow, pale-yellow, gray-white, white, colorless

Lustre:

Vitreous, Sub-Vitreous

Hardness:

Specific Gravity:

3.33 (Calculated)

Crystal System:

Tetragonal

Member of:

Henritermierite Group > Garnet Supergroup

Name:

Honors Dr. Dan Holtstam (b. 1963) for his contributions to Swedish mineralogy and specifically Mn deposits of the Långban type.

Type Locality:

ⓘ Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Garnet Group. The aluminum analogue of Henritermierite.

Compare also the Grossular-Katoite Series.

Unique IdentifiersHide

Mindat ID:

27532

Long-form identifier:

mindat:1:1:27532:7

GUID
(UUID V4):

34c0182a-ef5f-42f7-80d9-57419d79e140

IMA Classification of HoltstamiteHide

IMA status:

Approved

IMA Formula:

Ca₃Al₂(SiO₄)₂(OH)₄

Approval year:

2003

First published:

2005

Type description reference:

Halenius, U., Haeussermann, U., and Harryson, H. (2005) Holtstamite, Ca3(Al,Mn 3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet from Wessels Mine, South Africa. European Journal of Mineralogy: 17(2): 375-382.

Classification of HoltstamiteHide

Strunz-mindat (2024):

9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination

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

Pronunciation of HoltstamiteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of HoltstamiteHide

Lustre:

Vitreous, Sub-Vitreous

Transparency:

Transparent

Colour:

Brownish-yellow, pale-yellow, gray-white, white, colorless

Hardness:

6 on Mohs scale

Tenacity:

Brittle

Cleavage:

None Observed

Fracture:

Conchoidal

Density:

3.33 g/cm³ (Calculated)

Optical Data of HoltstamiteHide

Type:

Uniaxial (+)

RI values:

n_ω = 1.718 n_ε = 1.746

Birefringence:

0.028

Max Birefringence:

δ = 0.028

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

Surface Relief:

High

Optical Extinction:

Parallel

Pleochroism:

Weak

Comments:

O = pale orange yellow and E = lemon yellow.

Comments:

Absorption: E > O.

Chemistry of HoltstamiteHide

Mindat Formula:

Ca₃Al₂(SiO₄)₂[◻(OH)₄]

Elements listed:

Al, Ca, H, O, Si - search for minerals with similar chemistry

Crystallography of HoltstamiteHide

Crystal System:

Tetragonal

Class (H-M):

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

Space Group:

I4₁/acd

Cell Parameters:

a = 12.337 Å, c = 11.93 Å

Ratio:

a:c = 1 : 0.967

Unit Cell V:

1,815.76 Å³ (Calculated from Unit Cell)

Twinning:

Twinning around [111], creating pseudo-octahedrons.

Crystal StructureHide

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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4

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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)
0007101	Holtstamite	Halenius U, Haussermann U, Harryson H (2005) Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet from Wessels Mine, South Africa European Journal of Mineralogy 17 375-382		2005	Wessels Mine, South Africa	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Holtstamite'
loop_
_publ_author_name
'Halenius U'
'Haussermann U'
'Harryson H'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 17 
_journal_year 2005
_journal_page_first 375
_journal_page_last 382
_publ_section_title
;
 Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet
 from Wessels Mine, South Africa
;
_database_code_amcsd 0007101
_chemical_compound_source 'Wessels Mine, South Africa'
_chemical_formula_sum 'Ca3 (Mn1.006 Al.994) Si1.95 O12 H4'
_cell_length_a 12.337
_cell_length_b 12.337
_cell_length_c 11.930
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1815.765
_exptl_crystal_density_diffrn      3.315
_symmetry_space_group_name_H-M 'I 41/a c d'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '1/4-y,3/4-x,3/4+z'
  '3/4-y,1/4-x,1/4+z'
  '1/4+y,3/4+x,3/4-z'
  '3/4+y,1/4+x,1/4-z'
  '1/4+y,3/4-x,1/4-z'
  '3/4+y,1/4-x,3/4-z'
  '1/4-y,3/4+x,1/4+z'
  '3/4-y,1/4+x,3/4+z'
  '1/2+x,-y,z'
  '+x,1/2-y,1/2+z'
  '1/2-x,y,-z'
  '-x,1/2+y,1/2-z'
  '1/2+x,y,1/2-z'
  '+x,1/2+y,-z'
  '1/2-x,-y,1/2+z'
  '-x,1/2-y,+z'
  '1/4+y,1/4+x,1/4+z'
  '3/4+y,3/4+x,3/4+z'
  '1/4-y,1/4-x,1/4-z'
  '3/4-y,3/4-x,3/4-z'
  '1/4-y,1/4+x,3/4-z'
  '3/4-y,3/4+x,1/4-z'
  '1/4+y,1/4-x,3/4+z'
  '3/4+y,3/4-x,1/4+z'
  '-x,y,1/2+z'
  '1/2-x,1/2+y,+z'
  'x,-y,1/2-z'
  '1/2+x,1/2-y,-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
_atom_site_U_iso_or_equiv
CaA1   0.36580   0.00000   0.25000   1.00000   0.01370
CaA2   0.00000   0.25000   0.12500   1.00000   0.01510
Mn3+B   0.00000   0.00000   0.00000   0.50300   0.01060
AlB   0.00000   0.00000   0.00000   0.49700   0.01060
Si1   0.11800   0.00000   0.25000   0.92000   0.01060
Si2   0.50000   0.25000   0.12500   0.11000   0.01900
O1   0.29300   0.71670   0.09790   1.00000   0.01650
O2   0.15560   0.55000   0.04940   1.00000   0.01890
O3   0.44420   0.35860   0.02220   1.00000   0.01860
H   0.45300   0.33300   0.08200   1.00000   0.04000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.082 Å	(44)
2.978 Å	(45)
2.757 Å	(55)
2.743 Å	(100)
2.685 Å	(54)
2.501 Å	(47)
1.671 Å	(37)
1.633 Å	(39)
1.614 Å	(56)

Comments:

Halenius U , Haussermann U , Harryson H , European Journal of Mineralogy , 17 (2005) p.375-382, Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet, from Wessels Mine, South Africa, Locality: Wessels Mine, South Africa

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]

Type Occurrence of HoltstamiteHide

Type Locality:

ⓘ Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

General Appearance of Type Material:

Rounded grains (up to 3 mm) composed of small (< 0.4 mm) commonly twinned crystals. Occasionally, the crystals make up
pseudo-octahedra.

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, no. 960380.

Geological Setting of Type Material:

Calc-silicate skarn.

Associated Minerals at Type Locality:

Manganvesuvianite

Henritermierite

Calcite

Reference:

Download:

https://rruff.info/rruff_1.0/uploads/EJM17_375.pdf

Synonyms of HoltstamiteHide

IMA2003-047

Other Language Names for HoltstamiteHide

Russian:Хольцтамите

Simplified Chinese:四方水钙榴石

Traditional Chinese:四方水鈣榴石

Relationship of Holtstamite to other SpeciesHide

Member of:

Henritermierite Group > Garnet Supergroup

Other Members of this group:

Henritermierite

Ca₃Mn³⁺₂(SiO₄)₂[◻(OH)₄]

Tet. 4/mmm (4/m 2/m 2/m) : I4₁/acd

Common AssociatesHide

Associated Minerals Based on Photo Data:

1 photo of Holtstamite associated with Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
1 photo of Holtstamite associated with Calcite	CaCO₃

Related Minerals - Strunz-mindat Grouping Hide

9.AD.	Adrianite	Ca₁₂(Al₄Mg₃Si₇)O₃₂Cl₆	Iso. 4 3m : I4 3d
9.AD.05	Larnite	Ca₂SiO₄	Mon. 2/m
9.AD.10	Calcio-olivine	Ca₂SiO₄	Orth. mmm (2/m 2/m 2/m)
9.AD.15	Merwinite	Ca₃Mg(SiO₄)₂	Mon. 2/m : P2₁/b
9.AD.20	Bredigite	Ca₇Mg(SiO₄)₄	Orth. mm2 : Pnn2
9.AD.25	Andradite	Ca₃Fe³⁺₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Almandine	Fe²⁺₃Al₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Calderite	Mn²⁺₃Fe³⁺₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Goldmanite	Ca₃V³⁺₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Grossular	Ca₃Al₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Henritermierite	Ca₃Mn³⁺₂(SiO₄)₂[◻(OH)₄]	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/acd
9.AD.25	Kimzeyite	Ca₃Zr₂(SiO₄)(AlO₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Knorringite	Mg₃Cr₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Majorite	Mg₃(MgSi)(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Morimotoite	Ca₃(TiFe²⁺)(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Pyrope	Mg₃Al₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Schorlomite	Ca₃Ti₂(SiO₄)(Fe³⁺O₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Spessartine	Mn²⁺₃Al₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Uvarovite	Ca₃Cr₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Wadalite	(Ca,Mg)₆(Al,Fe³⁺)₄((Si,Al)O₄)₃O₄Cl₃	Iso. 4 3m : I4 3d
9.AD.25 va	Hydrougrandite	(Ca,Mg,Fe²⁺)₃(Fe³⁺,Al)₂[(OH)₄(SiO₄)₂]	Iso.
9.AD.25 va	Yamatoite	(Mn²⁺,Ca)₃(V³⁺,Al)₂(SiO₄)₃	Iso.
9.AD.25	Khoharite	Mg₃Fe³⁺₂(SiO₄)₃
9.AD.25	Kerimasite	Ca₃Zr₂(SiO₄)(Fe³⁺O₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Toturite	Ca₃Sn₂(SiO₄)(Fe³⁺O₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Momoiite	Mn²⁺₃V³⁺₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Eringaite	Ca₃Sc₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Irinarassite	Ca₃Sn₂(SiO₄)(AlO₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Menzerite-(Y)	(Y₂Ca)Mg₂(SiO₄)₃	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	Eltyubyuite	Ca₁₂Fe³⁺₁₀Si₄O₃₂Cl₆	Iso. 4 3m : I4 3d
9.AD.25	Blythite	Mn²⁺₃Mn³⁺₂[SiO₄]₃
9.AD.25	Skiagite	Fe²⁺₃Fe³⁺₂[SiO₄]₃
9.AD.25	Hutcheonite	Ca₃Ti₂(SiO₄)(AlO₄)₂	Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25	UM1984-37-SiO:CrMn	Mn²⁺₃Cr³⁺₂(SiO₄)₃
9.AD.25	Rubinite	Ca₃Ti³⁺₂Si₃O₁₂	Iso.
9.AD.25	Nikmelnikovite	Ca₁₂(Fe²⁺Fe³⁺₃Al₃◻)[SiO₄]₆[◻(OH)₄]₅◻₄	Trig. 3 : R3
9.AD.25	Midbarite	Ca₃Mg₂(V₂Si)O₁₂	Iso. m3m (4/m 3 2/m)
9.AD.30 va	Auerlite	near Th(Si,P)O₄
9.AD.30	Coffinite	U(SiO₄) · nH₂O	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
9.AD.30	Hafnon	HfSiO₄	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
9.AD.30	Thorite	Th(SiO₄)	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
9.AD.30	Zircon	Zr(SiO₄)	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
9.AD.30	Stetindite-(Ce)	Ce(SiO₄)	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
9.AD.35	Huttonite	ThSiO₄	Mon. 2/m
9.AD.35	Tombarthite-(Y)	Y₄(Si,H₄)₄O_12-x(OH)_4+2x	Mon.
9.AD.40	Eulytine	Bi₄(SiO₄)₃	Iso. 4 3m : I4 3d
9.AD.45	Reidite	ZrSiO₄	Tet. 4/m : I4₁/a
9.AD.55	Jeffbenite	Mg₃Al₂Si₃O₁₂	Tet. 4 2m : I4 2d

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 HoltstamiteHide

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https://www.mindat.org/min-27532.html
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External Links:

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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 HoltstamiteHide

Reference List:

(2023) Holtstamite. Handbook of Mineralogy. Mineralogical Society of America

Localities for HoltstamiteHide

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.


Japan
Saitama Prefecture Chichibu City Ohtaki-mura Nakatsugawa Chichibu mining district ⓘ Sekkaisawa	Nishio-Hamane D. et al. (2019)

Morocco
Drâa-Tafilalet Region Zagora Province Agdz Cercle Tansifte Caïdat ⓘ Tachgagalt Mine	EDXS analyses by P. Roth

South Africa (TL)
Northern Cape John Taolo Gaetsewe District Municipality Joe Morolong Local Municipality ⓘ Wessels Mine (TL)	European Journal of Mineralogy: 17 (2) +1 other reference

Sweden
Värmland County Filipstad Långban Ore District ⓘ Långban Mine	Originally identified as ...

Holtstamite

About HoltstamiteHide

Unique IdentifiersHide

IMA Classification of HoltstamiteHide

Classification of HoltstamiteHide

Mineral SymbolsHide

Pronunciation of HoltstamiteHide

Physical Properties of HoltstamiteHide

Optical Data of HoltstamiteHide

Chemistry of HoltstamiteHide

Crystallography of HoltstamiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of HoltstamiteHide

Synonyms of HoltstamiteHide

Other Language Names for HoltstamiteHide

Relationship of Holtstamite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for HoltstamiteHide

References for HoltstamiteHide

Localities for HoltstamiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide