Platynite Mineral Data

General Platynite Information

Chemical Formula:

(Bi,Pb)3(Se,S)4

Composition:

Molecular Weight = 894.11 gm

Bismuth 46.75 % Bi

Lead 23.17 % Pb

Selenium 26.49 % Se

Sulfur 3.59 % S

______

100.00 %

Empirical Formula:

Bi₂PbSe₃S

Environment:

Discredited as being a mixture of laitakarite and selenian galena.

IMA Status:

Discredited IMA 1999 - Valid Species (Pre-IMA) 1910

Locality:

Falun, Dalecarlia, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named in 1910 from the Greek "to broaden", in allusion to its platy habit.

Name Pronunciation:

Platynite + Pronunciation

Synonym:

Discredited

IMA1999-A

Platynite Image

Images:

Platynite Paraguanajuatite

Comments: Bright metallic gray platy crystalline platynite, with dull black paraguanajuatite.
Location: Falun, Kopparberg, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Platynite Crystallography

Axial Ratios:

a:c = 1:2.44994

Cell Dimensions:

a = 8.49, c = 20.8, Z = 8; V = 1,298.40 Den(Calc)= 9.15

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 3.965(1), 2.971(0.4), 5.45(0.2),

Physical Properties of Platynite

Cleavage:

{001} Good, {010} Good, {100} Good

Color:

Gray, Black, White.

Density:

7.98

Diaphaneity:

Opaque

Habit:

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

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

shining black

Optical Properties of Platynite

RL Anisotrophism:

Strong.

Calculated Properties of Platynite

Electron Density:

Bulk Density (Electron Density)=7.49 gm/cc
note: Specific Gravity of Platynite =9.15 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Platynite=1,376.33 barns/electron
U=PE_Platynite x rElectron Density=10310.12 barns/cc.

Radioactivity:

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

Platynite Classification

Dana Class:

02.08.21.01 (02)Sulfides - Including Selenides and Tellurides

(02.08)where Am Bn Xp, with (m+n):p=1:1

(02.08.21)Dana Group

02.08.21.01 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

Strunz Class:

02.DC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.D - Metal Sulfides, M:S = 3:4 and 2:3

02.DC -Variable M:S

02.DC.05 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

Other Platynite Information

References:

NAME( CanMin, 10/99) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Platynite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Platynite here :
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Print or Cut-and-Paste your Platynite Specimen Label here :

Platynite

(Bi,Pb)3(Se,S)4
Dana No: 02.08.21.01 Strunz No: 02.DC.05
Locality:

Notes: