Gersdorffite Mineral Data

General Gersdorffite Information

Chemical Formula:

NiAsS

Composition:

Molecular Weight = 165.68 gm

Nickel 35.42 % Ni

Arsenic 45.22 % As

Sulfur 19.35 % S

______

100.00 %

Empirical Formula:

NiAsS

Environment:

In hydrothermal vein deposits formed at moderate tempertures.

IMA Status:

Valid Species (Pre-IMA) 1843

Locality:

Zinkwand, Schladming, Styria, Austria. Link to MinDat.org Location Data.

Name Origin:

Named after Herr von Gersdorff, owner of Schladming Mine, Austria.

Name Pronunciation:

Gersdorffite + Pronunciation

Synonym:

Gray nickel pyrites

Nickel glance

Gersdorffite Image

Images:

Gersdorffite

Comments: Massive to coarse-grained lead-gray gersdorffite crystals.
Location: Ait Ahmane Mine, Bou Azzer, Anti Atlas Mts., Morocco. Scale: Not Given.
© John Veevaert

Gersdorffite Crystallography

Cell Dimensions:

a = 5.719, Z = 4; V = 187.05 Den(Calc)= 5.88

Crystal System:

Isometric - TetartoidalH-M Symbol (2 3) Space Group: P 2₁3

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

By Intensity(I/I_o): 2.545(1), 2.325(0.9), 1.716(0.8),

Forms:

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Forms: ( 0 1 1) ( 1 1 1) ( 1 0 0)

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Crystal Structure:

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Bayliss P , American Mineralogist , 53 (1968) p.290-293, The crystal structure of disordered gersdorffite

View Additional jPOWD Structure files for Gersdorffite
[1] [2]

Physical Properties of Gersdorffite

Cleavage:

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

Color:

Gray, Grayish black, Silver white, Tin white.

Density:

5.9 - 6.33, Average = 6.11

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

grayish black

Optical Properties of Gersdorffite

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Gersdorffite in Air**
λ	R	∑ R(λ)
400 nm	47.40
420 nm	46.60
440 nm	45.80
460 nm	45.40
480 nm	45.10
500 nm	45.00
520 nm	45.00
540 nm	45.00
560 nm	45.10
580 nm	45.30
600 nm	45.50
620 nm	45.90
640 nm	46.20
660 nm	46.50
680 nm	46.90
700 nm	47.30

**Calculated Relative Intensity Colors of Gersdorffite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R

Calculated Properties of Gersdorffite

Electron Density:

Bulk Density (Electron Density)=5.47 gm/cc
note: Specific Gravity of Gersdorffite =5.88 gm/cc.

Fermion Index:

Fermion Index = 0.0054545213
Boson Index = 0.9945454787

Photoelectric:

PE_Gersdorffite= 47.24 barns/electron
U=PE_Gersdorffite x rElectron Density= 258.17 barns/cc.

Radioactivity:

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

Gersdorffite Classification

Dana Class:

02.12.03.02 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals)

02.12.03.01 Cobaltite CoAsS P ca2₁ mm2

02.12.03.02 Gersdorffite NiAsS P 2₁3 2 3

02.12.03.03 Ullmannite NiSbS P 2₁3 2 3

02.12.03.04 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.12.03.05 Tolovkite IrSbS P 2₁3 2 3

02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.12.03.10 Padmaite PdBiSe P 2₁3 2 3

02.12.03.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.12.03.12 Maslovite PtBiTe P 2₁3 2 3

02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.12.03.14 Changchengite! IrBiS P 2₁3 2 3

02.12.03.15 Milotaite! PdSbSe P 2₁/3 2 3

02.12.03.16 Kalungaite! PdAsSe Pa3 2/m 3

Strunz Class:

02.EB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.25 Cobaltite CoAsS P ca2₁ mm2

02.EB.25 Changchengite! IrBiS P 2₁3 2 3

02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.EB.25 Gersdorffite NiAsS P 2₁3 2 3

02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.EB.25 Krutovite NiAs2 P a3 2/m 3

02.EB.25 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.EB.25 Maslovite PtBiTe P 2₁3 2 3

02.EB.25 Mayingite IrBiTe P a3 2/m 3

02.EB.25 Padmaite PdBiSe P 2₁3 2 3

02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.EB.25 Ullmannite NiSbS P 2₁3 2 3

02.EB.25 Tolovkite IrSbS P 2₁3 2 3

02.EB.25 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.EB.25 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3

02.EB.25 Milotaite! PdSbSe P 2₁/3 2 3

Other Gersdorffite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Gersdorffite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - WWW-MINCRYST

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

Gersdorffite

NiAsS
Dana No: 02.12.03.02 Strunz No: 02.EB.25
Locality:

Notes: