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Cryptophyllite

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Formula:
K2Ca[Si4O10] · 5H2O
System:
Monoclinic
Colour:
colourless
Closely related to shlykovite and mountainite.

Classification of Cryptophyllite

Approved 2008
mindat.org URL:
http://www.mindat.org/min-39306.html
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First Recorded Occurrence of Cryptophyllite

General Appearance of First Recorded Material:
colorless lamellar intergrowths with shlykovite
Geological Setting of First Recorded Material:
alkaline igneous rock
Associated Minerals at First Recorded Locality:

Physical Properties of Cryptophyllite

Colour:
colourless

Crystallography of Cryptophyllite

Crystal System:
Monoclinic
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 Volume:
V 1,451.93 ų (Calculated from Unit Cell)
X-Ray 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)

Chemical Properties of Cryptophyllite

Formula:
K2Ca[Si4O10] · 5H2O
Essential elements:
All elements listed in formula:

Other Names for Cryptophyllite

Name in Other Languages:

Other Information

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 Cryptophyllite

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[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 Cryptophyllite

Localities for Cryptophyllite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Rasvumchorr Mt
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)
Mineral and/or Locality  
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