Korobitsynite Mineral Data

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General Korobitsynite Information

Chemical Formula:

Na3(Ti,Nb)2[Si4O12](OH,O)2•3-4(H2O)

Composition:

Molecular Weight = 578.44 gm

Sodium 10.33 % Na 13.93 % Na₂O

Titanium 12.42 % Ti 20.71 % TiO₂

Niobium 8.03 % Nb 11.49 % Nb₂O₅

Silicon 19.42 % Si 41.55 % SiO₂

Hydrogen 1.39 % H 12.46 % H₂O

Oxygen 48.40 % O

______ ______

100.00 % 100.14 % = TOTAL OXIDE

Empirical Formula:

Na_2.6Ti_1.5Nb_0.5Si₄O₁₃(OH)•3.5(H₂O)

Environment:

Found in hydrothermally affected agpaitic rocks. The Ti-dominant analog of nenadkevichite. It forms epitaxial overgrowths on elpidite crystals.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Alluaiv and Karnasurt Mountains, Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Mikhail Fedorovich Korobitsyn (1928-1996), amateur mineralogist and collector who made significant contributions to mineralogical investigations of the Lovozero alkaline complex.

Korobitsynite Image

Images:

Korobitsynite

Comments: Colorless prismatic crystals of korobitsynite.
Location: Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Korobitsynite Crystallography

Axial Ratios:

a:b:c =0.5188:1:0.5033

Cell Dimensions:

a = 7.349, b = 14.164, c = 7.13, Z = 2; V = 742.17 Den(Calc)= 2.59

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.262(1), 6.53(0.85), 7.09(0.72),2.075(0.57), 2.553(0.56), 3.18(0.52), 1.735(0.5),

Forms:

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Forms: ( 0 1 0) ( 0 2 1) ( 1 0 0) ( 1 1 0) ( 0 0 1)

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Physical Properties of Korobitsynite

Cleavage:

{100} Imperfect

Color:

Colorless.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Korobitsynite

Gladstone-Dale:

CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2655,KC= 0.2674
Ncalc = 1.69

Optical Data:

Biaxial (+), a=1.646, b=1.654, g=1.763, bire=0.1170

Calculated Properties of Korobitsynite

Electron Density:

Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Korobitsynite =2.59 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Korobitsynite}= 14.43 barns/electron
U=PE_{Korobitsynite} x rElectron Density= 36.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Korobitsynite is Not Radioactive

Korobitsynite Classification

Dana Class:

60.01.03a.02 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03a)Labuntsovite Group (Nenadkevichite subgroup Orthorhombic [Pbam])

60.01.03a.01 Nenadkevichite! (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O) Pbam 2/m 2/m 2/m

60.01.03a.02 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2•3-4(H2O) Pbam 2/m 2/m 2/m

Strunz Class:

09.CE.30a 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.30a Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)•2(H2O) Pbam 2/m 2/m 2/m

09.CE.30a Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2•3-4(H2O) Pbam 2/m 2/m 2/m

Other Korobitsynite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(MinRec, Vol 31, No4) OPTIC PROP.(MinRec, Vol 31, No4)

See Also:

Links to other databases for Korobitsynite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Korobitsynite

Na3(Ti,Nb)2[Si4O12](OH,O)2•3-4(H2O)
Dana No: 60.01.03a.02 Strunz No: 09.CE.30a
Locality:

Notes: