Rammelsbergite Mineral Data

Rammelsbergite Mineral Data +

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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).

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),

Physical Properties of Rammelsbergite

Cleavage:

[???] Indistinct

Color:

Tin white, Reddish white.

Density:

7.1

Diaphaniety:

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:

None.

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:

r_electron=6.40 gm/cc
note: r_{Rammelsbergite}=7.10 gm/cc.

Fermion Index

Fermion Index = 0.00318
Boson Index = 0.99682

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rammelsbergite is Not Radioactive

Rammelsbergite Classification

Dana Class:

2.12.2.12 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.23-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.23 - Löllingite - Costibite series

II/D.23-10 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

II/D.23-20 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

II/D.23-30 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

II/D.23-40 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

II/D.23-50 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

II/D.23-60 Costibite CoSbS P mn2₁ mm2

II/D.23-70 Oenite! CoSbAs Unk Ortho

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 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
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: 2.12.2.12 Strunz No: II/D.23-30
Locality:

Notes: