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Miassite (Prassoit)

Collectors Summary

Color hellgrau mit keinen internen Reflektionen
Hardness (Mohs) 6
Cleavages keine
Crystal System kubisch, Pm3m

Chemism

Chemical formula

Rh17S15

Chemical composition

Rhodium, Schwefel

Unit weight: 2230.376034 u; Number of atoms in the formula: 32

Info

Empirical formula:

Rh17S15

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

21.57

15

46.88

32.0655000

480.9825000
Rhodium

Rh

78.43

17

53.13

102.9055020

1,749.3935340

Analysis wt%

Ø Ru : 0.40, Rh : 59.30, Pd : 6.40, Ir : 0.50, Pt : 6.80, Fe : 1.40, Ni : 1.90, Cu : 1.80, S : 21.00, PLT : 74.00 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2001)

Strunz 9th edition incl. updates

2.BC.05

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
B: Metallsulfide, M : S > 1 : 1 (hauptsächlich 2 : 1)
C: mit Rhodium (Rh), Palladium (Pd), Platin (Pt), usw.
05:Palladseit-Gruppe

Lapis Classification

II/B.16-080

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
16: Sulfide mit vorherrschend Nickel, Kobalt, Rhodium und Palladium; Pentlandit-Gruppe

Classification by Hölzel

2.BC.110

2: SULFIDES
B: Sulfides (etc) with Me/S > 1/1 (mostly 2/1)
C: With Pd
1: Oosterboschite-Palladseite-Group

Dana 8th edition

02.16.19.02

02: Sulfide Minerals
16: Sulfides - Including Selenides and Tellurides with miscellaneous formulae
19: Palladseite Group

IMA status

Mit Anerkennung der CNMNC umbenannt

Optical Properties

Color

hellgrau mit keinen internen Reflektionen

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

221

Space Group

Pm3m

Cell parameters a (Å)

10.024

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

1007.217

X-Ray Powder Diffraction

3.33(20),
3.17(70),
3.02(90),
2.68(50),
2.42(20),
2.24(90),
1.931(80),
1.774(100)
XRD chart Miassite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (10g)

Density (g/cm³)

7.42 (berechnet)

7.354 ( ρ calc. Mineralienatlas )

Cleavages

keine

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Ural, Föderationskreis/Tscheljabinsk, Oblast/Ilmen-Gebirge/Miass (Miask)/Seifenlagerstätte

Preface

Author (Name, Year)

Britvin & Rudashevsky & Bogdanova & Shcherbachev, 2001

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 130 (2001) (2), 41

Other languages

German

Miassit

Spanish

Miassita

French

Miassite

English

Miassite

Russian

Миассит

Traditional Chinese

密硫銠礦

Simplified Chinese

密硫铑矿

Alternative Name

Prassoit

Prassoita

Prassoite

CNMNC (IMA)-Number

IMA 1970-041

IMA 1997-029

CNMNC symbol

Symbol

Mia

Locations with GPS information