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Cryptophyllite

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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
Closely related to shlykovite and mountainite.


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Classification of CryptophylliteHide

Approved
Approval Year:
2008

Pronounciation of CryptophylliteHide

Pronounciation:
PlayRecorded byFrom
Jolyon & Katya RalphUnited 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:
nα = 1.520(2) nβ = 1.523(2) nγ = 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

Chemical Properties of CryptophylliteHide

Formula:
K2Ca[Si4O10] · 5H2O

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 ų (Calculated from Unit Cell)
Z:
4
Comment:
P 21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
16.01 (100)
7.98 (24)
6.24 (48)
3.228 (22)
3.197 (27)
2.995 (47)
2.903 (84)
2.623 (23)

Type Occurrence of CryptophylliteHide

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

Other Language Names for CryptophylliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Shlykovite1 photo of Cryptophyllite associated with Shlykovite on mindat.org.

Fluorescence of CryptophylliteHide

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.

References for CryptophylliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, 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.

Internet Links for CryptophylliteHide

Localities for CryptophylliteHide

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Rasvumchorr Mt
            • Rasvumchorr Mine
Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia,Zapiski RMO, 139(1),37(2010); Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia. Zapiski RMO, 139(1), 37-50.
Mineral and/or Locality  
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