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Stillwaterite

Collectors Summary

Color hellcremig grau
Lustre Metallglanz
Hardness (Mohs) 5
Crystal System trigonal, P3, P3

Chemism

Chemical formula

Pd8As3

Empirical formula (analysis)

Pd7.87As3

Chemical composition

Arsen, Palladium

Unit weight: 1062.298076 u; Number of atoms in the formula: 10.87

Info

Empirical formula:

Pd7.87As3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Arsenic

As

21.16

3

27.60

74.9216020

224.7648060

Palladium

Pd

78.84

7.87

72.40

106.4210000

837.5332700

Analysis wt%

Pd : 78.20, As : 17.30, Sb : 0.70, Te : 1.10, Sn : 3.00, Bi : 1.30, PLT : 78.30 (Ref: Canadian Mineralogist 75)

Strunz 9th edition incl. updates

2.AC.10

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
A: Legierungen und legierungsartige Verbindungen
C: Verbindungen von Halbmetallen mit Platin-Gruppen-Elementen (PGE)
10:Stillwaterit-Gruppe

Lapis Classification

II/A.05-030

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
A: Legierungen und legierungsartige Verbindungen
5: mit Metallen der Platin-gruppe (v.a. Pd)

Classification by Hölzel

2.AC.230

2: SULFIDES
A: Alloys of Cu,Ag,Au,Ni,Pd with As,Sb,Bi,(Te)
C: With Pd
2: Stillwaterite-Group

Dana 8th edition

02.16.04.01

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellcremig grau

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Anisotropism

schwach an der Luft, dunkelgrau tu bräunlichgrau; In Öl ausgeprägt bräunlichschwarz mit einem blau zu gelbbraun Farbton

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 51.6, 52.7, 52.2
(546) 52.5, 53.2, 52.9
(589) 53.1, 53.7, 53.4
(650) 54.4, 55.0, 54.7

Reflection chart Stillwaterite

Crystallography

Crystal System

trigonal

Class (H-M)

3, 3

Space Group number

143, 147

Space Group

P3, P3

Cell parameters a (Å)

7.339

Cell parameters b (Å)

-

Cell parameters c (Å)

10.311

Cell parameters a/b or c/a

1.405

Cell parameters c/b

-

Z

3

Volume (ų)

480.956

Crystal structure

Oxana V. Karimova; Anna A. Mezhueva; Nikolay A. Zgurskiy; Andrey A. Zolotarev; Dmitriy A. Chareev: The crystal structure of Pd8As3, a synthetic analogue of stillwaterite. Mineralogical Magazine Vol. 86, Nr. 3 (2022) S. 492-499. doi: 10.1180/mgm.2022.57

X-Ray Powder Diffraction

2.700(30),
2.521(20),
2.355(80),
2.115(100),
1.511(20),
1.351(50),
1.201(20),
0.886(40)

XRD chart Stillwaterite

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

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

384 (30g)

Density (g/cm³)

10.96 (berechnet) 10.4 (gemssen)

11.002 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Montana/Stillwater Co./Stillwater Complex

Type material

Royal Ontario Museum, Toronto, Kanada

The Natural History Museum, London, England

National Museum of Natural History, Washington, D.C., USA

Collection number of type material

M33559 (Kanada), 1979,129 (England), 132500 (USA)

Preface

Name from

Der Typlokalität im Stillwater Co.

Author (Name, Year)

Cabri & Laflamme & Stewart & Rowland & Chen, 1975

References

Canadian Mineralogist 13 (1975), 321

Other languages

German

Stillwaterit

Spanish

Stillwaterita

English

Stillwaterite

French

Stillwaterite

Russian

Стиллуотерит

CNMNC (IMA)-Number

IMA 1974-029

CNMNC symbol

Symbol

Slw

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Id78oX9hyUS_RVeg-Bb7nw
GUID (Global unique identifier) A1FCDE21-617F-44C9-BF45-57A0F816FB9F
Database ID 3644