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Shlykovite

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About ShlykoviteHide

Formula:
KCa[Si4O9(OH)] · 3H2O
Colour:
greyish white to slightly beige
Lustre:
Pearly
Hardness:
2½ - 3
Specific Gravity:
2.244 (Calculated)
Crystal System:
Monoclinic
Name:
In memory of Russian geologist Valerii Georgievich Shlykov (1941– 2007), a specialist in X-ray studies of phyllosilicates, mineralogy of sedimentary rocks, lithology, and pedology. V.G. Shlykov, a scientist and lecturer, worked at the Geology Faculty of Moscow State University.
Closely related to cryptophyllite and mountainite.


Classification of ShlykoviteHide

Approved
Approval Year:
2008

Physical Properties of ShlykoviteHide

Pearly
Transparency:
Transparent
Colour:
greyish white to slightly beige
Comment:
aggregates are translu cent to dull, white, beige, brownish, light cream, or pale yellowish–greyish. The lamellar segregations have a nacreous luster, whereas fibrous aggregates are silky.
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
parallel to (001).
Density:
2.244 g/cm3 (Calculated)

Optical Data of ShlykoviteHide

Type:
Biaxial (-)
RI values:
nα = 1.500(3) nβ = 1.505(2) nγ = 1.509(2)
2V:
Measured: 60° (20), Calculated: 78°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
medium, r < v
Pleochroism:
Non-pleochroic

Chemical Properties of ShlykoviteHide

Formula:
KCa[Si4O9(OH)] · 3H2O

Crystallography of ShlykoviteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.4897(4) Å, b = 6.9969(5) Å, c = 26.714(2) Å
β = 94.597(8)°
Ratio:
a:b:c = 0.928 : 1 : 3.818
Unit Cell V:
1,209.12 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.33 (100)
6.67 (76)
6.47 (55)
3.469 (45)
3.068 (57)
3.042 (45)
2.945 (62)
2.912 (90)

Type Occurrence of ShlykoviteHide

General Appearance of Type Material:
monomineralic segregations and intergrowths with cryptophyllite. Thin sheets or lamellae up to 0.02 × 0.2 × 0.5 mm in size (sporadically up to 0.03 × 0.3 × 1 mm) and flattened parallel to {001} are most frequent. Fine fibers up to 0.5 mm long are less fre
Place of Conservation of Type Material:
The type specimens are deposited at the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow; the registration number 3753/1
Geological Setting of Type Material:
alkaline igneous rock pegmatite
Associated Minerals at Type Locality:

Synonyms of ShlykoviteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cryptophyllite1 photo of Shlykovite associated with Cryptophyllite on mindat.org.

Fluorescence of ShlykoviteHide

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 ShlykoviteHide

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 ShlykoviteHide

Localities for ShlykoviteHide

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 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
    • Murmanskaya Oblast'
      • 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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