Vistepite Mineral Data

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

IMA Status:

Approved IMA 1992

Locality:

Link to MinDat.org Location Data.

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:

[???] Good

Color:

Yellowish orange.

Density:

3.67

Diaphaniety:

Transparent

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= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1907,KPDmeas= 0.1927,KC= 0.1948

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:

r_electron=3.49 gm/cc
note: r_Vistepite=3.67 gm/cc.

Fermion Index

Fermion Index = 0.03858
Boson Index = 0.96142

Photoelectric:

PE_Vistepite= 53.27 barns/electron
U=PE_Vistepite x r_electron= 185.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vistepite is Not Radioactive

Vistepite Classification

Dana Class:

78.1.10.1 (78)Unclassified silicates

(78.1)possible nesosilicates

(78.1.10)Dana Group

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

Strunz Class:

VIII/B.29-35 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.29 - Datolite/Gadolinite group

VIII/B.29-10 Datolite CaBSiO4(OH) P 2₁/c 2/m

VIII/B.29-20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

VIII/B.29-30 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

VIII/B.29-35 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1

VIII/B.29-40 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

VIII/B.29-50 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

VIII/B.29-60 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

VIII/B.29-70 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-80 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.29-90 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-100 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 2₁/a 2/m

Other Vistepite Information

References:

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

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Vistepite

Mn++4Sn++++B2(SiO4)4(OH)2
Dana No: 78.1.10.1 Strunz No: VIII/B.29-35
Locality:

Notes: