Prassoite Mineral Data

Prassoite Mineral Data

General Prassoite Information

Chemical Formula:

Rh17S15 (?)

Composition:

Molecular Weight = 2,230.38 gm

Rhodium 78.43 % Rh

Sulfur 21.57 % S

______

100.00 %

Empirical Formula:

Rh₁₇S₁₅

Environment:

Prassoite was approved as a valid species but never published. Miassite appearantly has priority as the valid name by publication.

IMA Status:

Approved IMA 1971 ? (Dana # Added)

Locality:

Tiébaghi massif, New Caledonia. Link to MinDat.org Location Data.

Synonym:

ICSD 23930

IMA1970-041

PDF 73-1433

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Prassoite Crystallography

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

Physical Properties of Prassoite

Color:

White.

Density:

7.6 - 7.61, Average = 7.6

Diaphaniety:

Opaque

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Metallic

Calculated Properties of Prassoite

Electron Density:

r_electron=6.85 gm/cc
note: r_Prassoite=7.61 gm/cc.

Fermion Index

Fermion Index = 0.00161
Boson Index = 0.99839

Photoelectric:

PE_Prassoite= 171.51 barns/electron
U=PE_Prassoite x r_electron=1,175.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Prassoite is Not Radioactive

Prassoite Classification

Dana Class:

2.16.19.2a (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.19)Dana Group

2.16.19.1 Palladseite Pd17Se15 P m3m 4/m 3 2/m

2.16.19.2 Miassite! Rh17S15 P m3m 4/m 3 2/m

2.16.19.2a Prassoite ! Rh17S15(?) P m3m 4/m 3 2/m

Strunz Class:

II/B.16-80* II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium

II/B.16 - Pentlandite group

II/B.16-10 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

II/B.16-20 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

II/B.16-30 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

II/B.16-40 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

II/B.16-50 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

II/B.16-60 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

II/B.16-70 Palladseite Pd17Se15 P m3m 4/m 3 2/m

II/B.16-80 Miassite! Rh17S15 P m3m 4/m 3 2/m

II/B.16-80* Prassoite Rh17S15(?) P m3m 4/m 3 2/m

Other Prassoite Information

References:

PHYS. PROP.(Am.Min.,Vol.74,p1220,1989)

See Also:

Links to other databases for Prassoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Prassoite

Rh17S15 (?)
Dana No: 2.16.19.2a Strunz No: II/B.16-80*
Locality:

Notes: