Rammelsbergite Mineral Data

General Rammelsbergite Information

Chemical Formula:

NiAs2

Composition:

Molecular Weight = 208.53 gm

Nickel 28.14 % Ni

Arsenic 71.86 % As

______

100.00 %

Empirical Formula:

NiAs₂

Environment:

In Ni and Co veins formed at moderate temperatures.

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Schneeberg District, Erzgebirge, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the German chemist and mineralogist, K. F. Rammelsberg (1812-1899).

Name Pronunciation:

Rammelsbergite + Pronunciation

Synonym:

ICSD 42571

PDF 14-Nov

Rammelsbergite Image

Images:

Rammelsbergite

Comments: Dull gray metallic botryoidal rammelsbergite aggregate with crystalline surface.
Location: Hudson Bay Mine, Rusty Lake, Gowganda, Ontario, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rammelsbergite Crystallography

Axial Ratios:

a:b:c =0.8269:1:0.6107

Cell Dimensions:

a = 4.78, b = 5.78, c = 3.53, Z = 2; V = 97.53 Den(Calc)= 7.10

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 2.552(1), 2.476(0.9), 2.843(0.65),

Crystal Structure:

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Kjekshus A , Peterzens P G , Rakke T , Andresen A F , Acta Chemica Scandinavica , A33 (1979) p.469-480, Compounds with the marcasite type crystal structure. XIII. Structural and, magnetic properties of CrtFe1-tAs2, CrtFe1-tSb2, Fe1-tNitAs2 and Fe1-tNitSb2, Locality: synthetic, Sample: NiAs2

Physical Properties of Rammelsbergite

Cleavage:

{???} Indistinct

Color:

Tin white, Reddish white.

Density:

7.1

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

grayish black

Optical Properties of Rammelsbergite

RL Anisotrophism:

Strong, especially in blues.

RL Color:

White, pure.

RL Pleochroism:

Weak, in yellow to pinkish hue and bluish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Rammelsbergite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	53.10	52.20
420 nm	54.20	54.20
440 nm	55.30	56.20
460 nm	56.00	57.60
480 nm	56.50	58.40
500 nm	56.60	58.70
520 nm	56.30	58.60
540 nm	56.00	58.20
560 nm	55.80	58.00
580 nm	55.80	57.80
600 nm	55.80	57.80
620 nm	55.70	57.60
640 nm	55.60	57.30
660 nm	55.60	57.00
680 nm	55.50	56.90
700 nm	55.40	56.80

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

Calculated Properties of Rammelsbergite

Electron Density:

Bulk Density (Electron Density)=6.40 gm/cc
note: Specific Gravity of Rammelsbergite =7.10 gm/cc.

Fermion Index:

Fermion Index = 0.0031802946
Boson Index = 0.9968197054

Photoelectric:

PE_{Rammelsbergite}= 63.48 barns/electron
U=PE_{Rammelsbergite} x rElectron Density= 406.30 barns/cc.

Radioactivity:

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

Rammelsbergite Classification

Dana Class:

02.12.02.12 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

02.EB.15a 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.15a Clinosafflorite (Co,Fe,Ni)As2 P 2₁/n 2/m

02.EB.15a Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.EB.15a Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.EB.15a Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.EB.15a Nisbite NiSb2 Pnnm 2/m 2/m 2/m

02.EB.15a Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.EB.15a Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

Other Rammelsbergite Information

References:

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

See Also:

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

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

Rammelsbergite

NiAs2
Dana No: 02.12.02.12 Strunz No: 02.EB.15a
Locality:

Notes: