Stillwaterite Mineral Data

Stillwaterite Mineral Data +

We specialise in top quality, fine minerals from Morocco, Namibia,
South Africa, Pakistan, Democratic Republic of Congo (ZaÃƒï¿½Ã‚Â¯re) and China
Worldwide Fine Minerals by B & C GOBIN

General Stillwaterite Information

Chemical Formula:

Pd8As3

Composition:

Molecular Weight = 1,076.12 gm

Arsenic 20.89 % As

Palladium 79.11 % Pd

______

100.00 %

Empirical Formula:

Pd₈As₃

Environment:

SM reef in the Stillwater layered basic intrusion. SM reef is a cumulate concentration of platinum group metals included in pyrrhotite crystals.

IMA Status:

Approved IMA 1975

Locality:

Stillwater Complex, Nye County, Montana, USA. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Search for Stillwaterite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Stillwaterite Crystallography

Axial Ratios:

a:c = 1:1.39356

Cell Dimensions:

a = 7.399, c = 10.311, Z = 3; V = 488.85 Den(Calc)= 10.97

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3

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

By Intensity(I/I_o): 2.115(1), 2.355(0.8), 1.351(0.5),

Physical Properties of Stillwaterite

Color:

Gray.

Density:

10.4

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Metallic

Optical Properties of Stillwaterite

RL Anisotrophism:

Weak in air, dark gray to brownish gray, in oil, distinct in brownish black with a blue to yellowish.

RL Color:

Light creamy gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Stillwaterite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	51.60	52.70
546 nm	52.50	53.20
589 nm	53.10	53.70
650 nm	54.40	55.00

**Calculated Relative Intensity Colors of Stillwaterite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R₁
R₂

Calculated Properties of Stillwaterite

Electron Density:

r_electron=9.52 gm/cc
note: r_{Stillwaterite}=11.0 gm/cc.

Fermion Index

Fermion Index = 0.17666
Boson Index = 0.82334

Photoelectric:

PE_{Stillwaterite}= 206.24 barns/electron
U=PE_{Stillwaterite} x r_electron=1,963.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stillwaterite is Not Radioactive

Stillwaterite Classification

Dana Class:

2.16.4.1 (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.4)Dana Group

2.16.4.1 Stillwaterite Pd8As3 P 3 3

Strunz Class:

II/A.05-30 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with metals of the Platinum series, (Palladium)

II/A.05 - Atheneite - Genkinite series

II/A.05-10 Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m

II/A.05-20 Vincentite (Pd,Pt)3(As,Sb,Te) Unk Mono

II/A.05-30 Stillwaterite Pd8As3 P 3 3

II/A.05-40 Arsenopalladinite Pd8(As,Sb)3 P1 1

II/A.05-50 Isomertieite Pd11Sb2As2 F d3m 4/m 3 2/m

II/A.05-60 Mertieite-I Pd11(Sb,As)4 Unk Hex

II/A.05-70 Mertieite-II Pd8(Sb,As)3 R 3c 3m

II/A.05-80 Stibiopalladinite Pd5Sb2 P 6₃mc 6mm

II/A.05-90 Palladoarsenide Pd2As P 2/m 2/m

II/A.05-100 Palladobismutharsenide Pd2(As,Bi) Pmcn,P 2₁cn Ortho

II/A.05-102 Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m

II/A.05-105 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho

II/A.05-110 Majakite PdNiAs Unk Hex

II/A.05-112 Menshikovite! Pd3Ni2As3 P 6₃/m,P 6₃, or P 6₃22 Hex

II/A.05-115 Polkanovite! Rh12As7 P 6₃m 6/m

II/A.05-120 Genkinite (Pt,Pd)4Sb3 P 4₁2₁2 4 2 2

Other Stillwaterite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Stillwaterite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

Search for Stillwaterite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Stillwaterite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Stillwaterite Mineral Data :

Ask about Stillwaterite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Stillwaterite

Pd8As3
Dana No: 2.16.4.1 Strunz No: II/A.05-30
Locality:

Notes: