Vistepite Mineral Data

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General Vistepite Information

Chemical Formula:

Mn++4Sn++++B2(SiO4)4(OH)2

Composition:

Molecular Weight = 762.43 gm

Manganese 28.82 % Mn 37.22 % MnO

Silicon 14.73 % Si 31.52 % SiO₂

Tin 15.57 % Sn 19.77 % SnO₂

Boron 2.84 % B 9.13 % B₂O₃

Hydrogen 0.26 % H 2.36 % H₂O

Oxygen 37.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₄SnB₂(SiO₄)₄(OH)₂

Environment:

In a rhodonite vein in biotite-quartz hornfels at the margin of a tin-bearing granite massif.

IMA Status:

Approved IMA 1992

Locality:

From Muzeinyi Sai [Museum Valley], near the Trudovye tin deposit, Inyl'chek Mountains, eastern Kyrgyzstan. Link to MinDat.org Location Data.

Name Origin:

Named for Victor Ivanovich Stepanov (1924-1988), mineralogist, A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.

Name Pronunciation:

Vistepite + Pronunciation

Synonym:

ICSD 84256

IMA1991-012

PDF 46-1408

Vistepite Image

Images:

Vistepite

Comments: Translucent platy vistepite fragment.
Location: Inelchek, Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vistepite Crystallography

Axial Ratios:

a:b:c =0.9467:1:1.0407

Cell Dimensions:

a = 6.973, b = 7.365, c = 7.665, Z = 1; alpha = 89.94°, beta = 62.94°, gamma = 76.88° V = 341.40 Den(Calc)= 3.71

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.392(1), 3.21(0.82), 2.23(0.69),

Crystal Structure:

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Hybler J , Petricek V , Jurek K , Skala R , Cisarova I , The Canadian Mineralogist , 35 (1997) p.1283-1292, Structure determination of vistepite SnMn4B2Si4O16(OH)2: Isotypism with, bustamite, revised crystallographic data and composition

Physical Properties of Vistepite

Cleavage:

{hkl} Perfect, {hkl} Perfect, {hkl} Perfect

Color:

Yellowish orange.

Density:

3.67

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vistepite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1896,KPDmeas= 0.1927,KC= 0.1948
Ncalc = 1.71 - 1.73

Optical Data:

Biaxial (-), a=1.696, b=1.711, g=1.715, bire=0.0190, 2V(Calc)=54, 2V(Meas)=54.3-57.

Calculated Properties of Vistepite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Vistepite =3.67 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Vistepite= 53.27 barns/electron
U=PE_Vistepite x rElectron Density= 185.66 barns/cc.

Radioactivity:

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

Vistepite Classification

Dana Class:

78.01.10.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.10)Dana Group

78.01.10.01 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1

Strunz Class:

09.BD.25 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BD -Si2O7 groups with additional anions;

09.BD.25 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1

Other Vistepite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.79,p1013,1994) OPTIC PROP.(Am.Min.,Vol.79,p1013,1994)

See Also:

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

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

Vistepite

Mn++4Sn++++B2(SiO4)4(OH)2
Dana No: 78.01.10.01 Strunz No: 09.BD.25
Locality:

Notes: