Baratovite Mineral Data

Baratovite Mineral Data +

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General Baratovite Information

Chemical Formula:

KCa7(Ti,Zr)2Li3Si12O36F2

Composition:

Molecular Weight = 1,408.90 gm

Potassium 2.78 % K 3.34 % K₂O

Lithium 1.48 % Li 3.18 % Li₂O

Calcium 19.91 % Ca 27.86 % CaO

Zirconium 3.24 % Zr 4.37 % ZrO₂

Titanium 5.10 % Ti 8.50 % TiO₂

Silicon 23.92 % Si 51.18 % SiO₂

Oxygen 40.88 % O

Fluorine 2.70 % F 2.70 % F

- % F -1.14 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KCa₇Ti_1.5Zr_0.5Li₃Si₁₂O₃₆F₂

Environment:

Occurs as an accessory mineral in quartz-albite-aegirine veinlets and in albitites in syenites. Isostructural with katayamalite and is the fluorine-rich endmember of the series.

IMA Status:

Approved IMA 1975

Locality:

From the Dara-I-Pioz massif, Alai Range, Tien Shan, Tadzhikistan. Link to MinDat.org Location Data.

Name Origin:

For Rauf Baratovich Baratov, Soviet petrographer, of Tadzhikistan.

Synonym:

ICSD 100493

PDF 33-811

Baratovite Image

Images:

Baratovite

Comments: Pale pink, pearly, micaceous baratovite in syenite rock.
Location: Dara-Pioz, Tien Shan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Baratovite Crystallography

Axial Ratios:

a:b:c =1.7381:1:2.1451

Cell Dimensions:

a = 16.94, b = 9.746, c = 20.907, Z = 4; beta = 112.5° V = 3,188.94 Den(Calc)= 2.93

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.22(1), 1.92(0.2), 2.41(0.2),1.49(0.1), 1.6(0.1), 3.02(0.1), 3.54(0.1), 4.81(0.1),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Menchetti S , Sabelli C , American Mineralogist , 64 (1979) p.383-389, The crystal structure of baratovite

View Additional jPOWD Structure files for Baratovite
[1]

Physical Properties of Baratovite

Cleavage:

[001] Perfect

Color:

Pearl white.

Density:

2.92

Diaphaniety:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Baratovite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2295,KPDmeas= 0.2303,KC= 0.2252

Optical Data:

Biaxial (+), a=1.672, b=1.672, g=1.673, bire=0.0010, 2V(Calc)=0, 2V(Meas)=60. Dispersion r > v strong.

Calculated Properties of Baratovite

Electron Density:

r_electron=2.89 gm/cc
note: r_Baratovite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.02297
Boson Index = 0.97703

Photoelectric:

PE_Baratovite= 8.73 barns/electron
U=PE_Baratovite x r_electron= 25.25 barns/cc.

Radioactivity:

GRapi = 39.51 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Baratovite - barely detectable

Baratovite Classification

Dana Class:

61.1.4.1 (61)Cyclosilicate Six-Membered Rings

(61.1)with [Si6O18] rings; possible (OH) and Al substitution

(61.1.4)Baratovite group

61.1.4.1 Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m

61.1.4.2 Katayamalite (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2 C1 1

Strunz Class:

VIII/E.14-10 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.14 - Baratovite series

VIII/E.14-10 Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m

Other Baratovite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Baratovite

KCa7(Ti,Zr)2Li3Si12O36F2
Dana No: 61.1.4.1 Strunz No: VIII/E.14-10
Locality:

Notes: