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Kolskyite

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Formula:
CaNa2Ti4(Si2O7)2O4(H2O)7
Colour:
Pinkish yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.509 (Calculated)
Crystal System:
Triclinic
Name:
Named after the Kola Peninsula (Kolskyi Poluostrov in Russian).
A new TS-block mineral (TS = titanium silicate).


Hide all sections | Show all sections

Classification of KolskyiteHide

Approved

Physical Properties of KolskyiteHide

Vitreous
Colour:
Pinkish yellow
Streak:
White
Hardness:
Cleavage:
Perfect
on {001}
Fracture:
Splintery
Density:
2.509 g/cm3 (Calculated)

Optical Data of KolskyiteHide

Type:
Biaxial (-)
RI values:
nα = 1.669 nβ = 1.701 nγ = 1.720
2V:
Measured: 73.6° (5), Calculated: 74.0°
Max Birefringence:
δ = 0.051
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
No discernible dispersion
Pleochroism:
Non-pleochroic

Chemical Properties of KolskyiteHide

Formula:
CaNa2Ti4(Si2O7)2O4(H2O)7
IMA Formula:
(Ca◻)Ti2Na2Ti2(Si2O7)2O4(H2O)7

Crystallography of KolskyiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 5.387(1) Å, b = 7.091(1) Å, c = 15.473(3) Å
α = 96.580(4)°, β = 93.948(4)°, γ = 89.818(4)°
Ratio:
a:b:c = 0.76 : 1 : 2.182
Unit Cell V:
585.8 ų
Morphology:
Platy

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
15.161(100)
3.069(12)
2.938(10)
2.810(19)
2.680(9)
2.618(8)
2.595(8)
1.771(9)
Comments:
From Type Description.

Type Occurrence of KolskyiteHide

General Appearance of Type Material:
Single, platy crystals 2–40 μm thick and up to 500 μm across.
Place of Conservation of Type Material:
Type material is deposited in the collections of the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, catalogue number 4383/1
Geological Setting of Type Material:
Pegmatite
Associated Minerals at Type Locality:

Synonyms of KolskyiteHide

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 KolskyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cámara, F., Sokolova, E., Hawthorne, F.C. and Khomyakov, A.P. (2013): Kolskyite, IMA 2013-005. CNMNC Newsletter No. 16, August 2013, page 2701; Mineralogical Magazine, 77, 2695-2709.
Cámara, F., Sokolova, E., Abdu, Y., Hawthorne, F.C., Khomyakov, A.P. (2013): Kolskyite (Ca☐)Na2Ti4(Si2O7)2O4(H2O)7, a group-IV Ti-disilicate from the Khibiny Alkaline Massif, Kola Peninsula, Russia: description and crystal structure. Canadian Mineralogist, 51, 921-936.

Internet Links for KolskyiteHide

Localities for KolskyiteHide

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
        • Kukisvumchorr Mt
Cámara, F., Sokolova, E., Abdu, Y., Hawthorne, F.C., Khomyakov, A.P. (2013): Kolskyite (Ca☐)Na2Ti4(Si2O7)2O4(H2O)7, a group-IV Ti-disilicate from the Khibiny Alkaline Massif, Kola Peninsula, Russia: description and crystal structure. Canadian Mineralogist, 51, 921-936.
Mineral and/or Locality  
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