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Cryptophyllite

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Formula:
K2Ca[Si4O10] · 5H2O
System:
Monoclinic
Colour:
colourless
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.

Classification of Cryptophyllite

Approved
Approval Year:
2008
mindat.org URL:
http://www.mindat.org/min-39306.html
Please feel free to link to this page.

Type Occurrence of Cryptophyllite

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:

Physical Properties of Cryptophyllite

Diaphaneity (Transparency):
Transparent
Colour:
colourless
Cleavage:
Perfect
parallel to (001)
Density:
2.185 g/cm3 (Calculated)

Crystallography of Cryptophyllite

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 Volume:
V 1,451.93 ų (Calculated from Unit Cell)
Z:
4
Comment:
P 21/n
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)

Optical Data of Cryptophyllite

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 Cryptophyllite

Formula:
K2Ca[Si4O10] · 5H2O
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 (TL)
 
  • 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); 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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