Yaroslavite Mineral Data

General Yaroslavite Information

Chemical Formula:

Ca3Al2F10(OH)2•(H2O)

Composition:

Molecular Weight = 416.21 gm

Calcium 28.89 % Ca 40.42 % CaO

Aluminum 12.97 % Al 24.50 % Al₂O₃

Hydrogen 0.97 % H 8.66 % H₂O

Oxygen 11.53 % O

Fluorine 45.65 % F 45.65 % F

- % F -19.22 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Al₂F₁₀(OH)₂•(H₂O)

Environment:

In banded fluorite-sellaite-tournaline ores.

IMA Status:

Approved IMA 1966

Locality:

Yaroslav, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Yaroslavite + Pronunciation

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Yaroslavite Crystallography

Axial Ratios:

a:b:c =1.5804:1:0.8155

Cell Dimensions:

a = 8.74, b = 5.53, c = 4.51, Z = 1; V = 217.98 Den(Calc)= 3.17

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 3.445(1), 2.222(0.8), 3.653(0.7),

Physical Properties of Yaroslavite

Cleavage:

{???} Good, {???} Good

Color:

White.

Density:

3.09

Diaphaneity:

Transparent

Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Weakly Fluorescent, Short UV=pale violet.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Yaroslavite

Optical Data:

Biaxial (-), a=1.413, b=1.416-1.417, g=1.423, bire=0.0100, 2V(Calc)=68-80, 2V(Meas)=74.

Calculated Properties of Yaroslavite

Electron Density:

Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Yaroslavite =3.17 gm/cc.

Fermion Index:

Fermion Index = 0.0004467921
Boson Index = 0.9995532079

Photoelectric:

PE_Yaroslavite= 4.23 barns/electron
U=PE_Yaroslavite x rElectron Density= 13.14 barns/cc.

Radioactivity:

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

Yaroslavite Classification

Dana Class:

11.06.15.01 (11)Halide Complexes; Alumino-fluorides

(11.06)with miscellaneous formulae

(11.06.15)Dana Group

11.06.15.01 Yaroslavite Ca3Al2F10(OH)2•(H2O) Unk Ortho

Strunz Class:

03.CB.50 03 - HALIDES

03.C - Complex Halides

03.CB -Neso-aluminofluorides

03.CB.50 Yaroslavite Ca3Al2F10(OH)2•(H2O) Unk Ortho

Other Yaroslavite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Yaroslavite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Yaroslavite Specimen Label here :

Yaroslavite

Ca3Al2F10(OH)2•(H2O)
Dana No: 11.06.15.01 Strunz No: 03.CB.50
Locality:

Notes: