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Cryptophyllite

Formula:
K
 
2
Ca[Si
 
4
O
 
10
]·5H
 
2
O
System:MonoclinicColour:colourless
This page provides mineralogical data about Cryptophyllite.

Classification of Cryptophyllite

IMA status:Approved 2008
mindat.org URL:http://www.mindat.org/min-39306.html
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Type Occurrence of Cryptophyllite

Type Locality:Tsentral'nyi mine (Centralnyi Mine), Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:colorless lamellar intergrowths with shlykovite
Geological Setting of type material:alkaline igneous rock
Associated Minerals at type locality:
ShlykoviteLamprophylliteK FeldsparEudialyteAegirine

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

Chemical Properties of Cryptophyllite

Formula:
K
 
2
Ca[Si
 
4
O
 
10
]·5H
 
2
O
All elements listed in formula:Ca, H, K, O, Si

Other Names for Cryptophyllite

Synonyms:
IMA2008-061
Other Languages:

Other Information

Health Warning: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. Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia // Zapiski RMO, in press.

Internet Links for Cryptophyllite

Search Engines:
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  • Look for Cryptophyllite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Cryptophyllite in the Natural History Museum (London) online catalogue
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    Localities for Cryptophyllite

    (TL) indicates type locality. ? 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, in press.
    Mineral and/or Locality
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