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Cryptophyllite

A valid IMA mineral species

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Search Photos of Cryptophyllite

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Cryptophyllite

Tsentral'nyi Mine, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia

Cryptophyllite

Tsentral'nyi Mine, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia

Cryptophyllite

Tsentral'nyi Mine, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia

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About CryptophylliteHide

Formula:

K₂Ca[Si₄O₁₀] · 5H₂O

Colour:

colourless

Specific Gravity:

2.185 (Calculated)

Crystal System:

Monoclinic

Name:

been derived from the Greek words κρυπτοζ (concealed) and ϕυλλον (leaf), which emphasize its layered structure (phyllosilicate) in combination with a lamellar habit

Type Locality:

ⓘ Tsentral'nyi Mine, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia

Closely related to shlykovite and mountainite.

Unique IdentifiersHide

Mindat ID:

39306

Long-form identifier:

mindat:1:1:39306:7

GUID
(UUID V4):

f0098d92-cc84-4df1-9f4d-887d4f735dd4

IMA Classification of CryptophylliteHide

IMA status:

Approved

Approval year:

2008

Classification of CryptophylliteHide

Strunz-mindat (2024):

9.E0.

9 : SILICATES (Germanates)
E : Phyllosilicates
0 :

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
Cp	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 CryptophylliteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of CryptophylliteHide

Transparency:

Transparent

Colour:

colourless

Cleavage:

Perfect
parallel to (001)

Density:

2.185 g/cm³ (Calculated)

Optical Data of CryptophylliteHide

Type:

Biaxial (+)

RI values:

n_α = 1.520(2) n_β = 1.523(2) n_γ = 1.527(2)

2V:

Measured: 70° , Calculated: 82°

Max Birefringence:

δ = 0.007

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

Surface Relief:

Low

Pleochroism:

Non-pleochroic

Chemistry of CryptophylliteHide

Mindat Formula:

K₂Ca[Si₄O₁₀] · 5H₂O

Elements listed:

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

Crystallography of CryptophylliteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

P2₁/m

Cell Parameters:

a = 6.4934(14) Å, b = 6.9919(5) Å, c = 32.087(3) Å
β = 94.680(12)°

Ratio:

a:b:c = 0.929 : 1 : 4.589

Unit Cell V:

1,451.93 Å³ (Calculated from Unit Cell)

Comment:

P 21/n

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)
0017557	Cryptophyllite	Zubkova N V, Filinchuk Y E, Pekov I V, Pushcharovsky D Y, Gobechiya E R (2010) Crystal structures of shlykovite and cryptophyllite: comparative crystal chemistry of phyllosilicate minerals of the mountainite family European Journal of Mineralogy 22 547-555		2010	Mount Rasvumchorr, Khibiny alkaline intrusion, Kola Peninsula, Russia	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Cryptophyllite'
loop_
_publ_author_name
'Zubkova N V'
'Filinchuk Y E'
'Pekov I V'
'Pushcharovsky D Y'
'Gobechiya E R'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 22 
_journal_year 2010
_journal_page_first 547
_journal_page_last 555
_publ_section_title
;
 Crystal structures of shlykovite and cryptophyllite: comparative crystal
 chemistry of phyllosilicate minerals of the mountainite family
;
_database_code_amcsd 0017557
_chemical_compound_source 'Mount Rasvumchorr, Khibiny alkaline intrusion, Kola Peninsula, Russia'
_chemical_formula_sum 'K2 Ca Si4 O15 H10'
_cell_length_a 6.4934
_cell_length_b 6.9919
_cell_length_c 32.087
_cell_angle_alpha 90
_cell_angle_beta 94.680
_cell_angle_gamma 90
_cell_volume 1451.932
_exptl_crystal_density_diffrn      2.199
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
K1  -0.07730   0.37570   0.14911   0.02670
K2   0.46420   0.36550   0.05485   0.04580
Ca   0.22750   0.84690   0.24478   0.01010
Si1   0.41660   0.13500   0.16108   0.00970
Si2   0.41560   0.57470   0.16335   0.00910
Si3  -0.21520   0.85680   0.17356   0.01010
Si4   0.14020   0.85390   0.11015   0.01020
O1   0.28200   0.57980   0.20226   0.01340
O2   0.45570   0.35560   0.14722   0.01410
O3   0.33990   0.10970   0.20594   0.01710
O4   0.06130   0.85220   0.06211   0.01680
O5   0.30510   0.68370   0.12212   0.01920
O6  -0.10770   0.90490   0.21850   0.01410
O7   0.64640   0.66110   0.17274   0.02020
O8  -0.05130   0.81940   0.13918   0.02210
O9   0.25180   0.05580   0.12330   0.02060
O10  -0.36360   0.03010   0.15437   0.01400
Wat1   0.59130   0.79090   0.26910   0.02030
Wat2  -0.33970   0.00700   0.06290   0.06400
Wat3   0.40710   0.71980   0.02280   0.04700
Wat4   0.11150   0.20500   0.02240   0.03500
Wat5  -0.12360   0.47150   0.06530   0.03600

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
16.01 Å	(100)
7.98 Å	(24)
6.24 Å	(48)
3.228 Å	(22)
3.197 Å	(27)
2.995 Å	(47)
2.903 Å	(84)
2.623 Å	(23)

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 CryptophylliteHide

Type Locality:

ⓘ Tsentral'nyi Mine, Rasvumchorr Mine, Rasvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia

General Appearance of Type Material:

colorless lamellar intergrowths with shlykovite

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow; registration number 3753/2

Geological Setting of Type Material:

alkaline igneous rock pegmatite

Associated Minerals at Type Locality:

Synonyms of CryptophylliteHide

IMA2008-061

Common AssociatesHide

Associated Minerals Based on Photo Data:

2 photos of Cryptophyllite associated with Shlykovite	KCa[Si₄O₉(OH)] · 3H₂O
1 photo of Cryptophyllite associated with Kalifersite	(K,Na)₅Fe³⁺₇Si₂₀O₅₀(OH)₆ · 12H₂O
1 photo of Cryptophyllite associated with Aegirine	NaFe³⁺Si₂O₆
1 photo of Cryptophyllite associated with Microcline	K(AlSi₃O₈)
1 photo of Cryptophyllite associated with Sodalite	Na₄(Si₃Al₃)O₁₂Cl

Fluorescence of CryptophylliteHide

In UV light:

none

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 CryptophylliteHide

mindat.org URL:

https://www.mindat.org/min-39306.html
Please feel free to link to this page.

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Look for Cryptophyllite in the Rock H. Currier Digital Library

External Links:

Look for Cryptophyllite on Webmineral

Look for Cryptophyllite on Wikipedia

Look for Cryptophyllite on Mineralien Atlas

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 CryptophylliteHide

Reference List:

Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si^4O^9(OH)]·3H^2O, and cryptophyllite, K^2Ca[Si^4O^1^0]·5H^2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia. Zapiski RMO, 139(1), 37-50.

Natalia V. Zubkova, Yaroslav E. Filinchuk, Igor V. Pekov, Dmitry Yu. Pushcharovsky, Elena R. Gobechiya (2010): Crystal structures of shlykovite and cryptophyllite. Comparative crystal chemistry of phyllosilicate minerals of the mountainite family. European Journal of Mineralogy 22, 547-555.

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

Localities for CryptophylliteHide

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.

Russia (TL)

Murmansk Oblast

Khibiny Massif

Rasvumchorr Mt

Rasvumchorr Mine

ⓘ Tsentral'nyi Mine (TL)

Pekov I.V. et al. (OH) +2 other references