Pararammelsbergite Mineral Data

Pararammelsbergite Mineral Data +

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General Pararammelsbergite 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 hydrotherma veins bearing Ni-Co mineralization. Trimorphous with rammelsbergite and krutovite.

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Gowganda, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

From the Greek, para -"similar" and the mineral Rammelsbergite named after the German chemist and mineralogist, K. F. Rammelsberg (1813-1899).

Synonym:

ICSD 24204

PDF 18-876

Pararammelsbergite Image

Images:

Pararammelsbergite

Comments: Columnar crystals of metallic gray pararammelsbergite on massive arsenide ore.
Location: Lawson Mine, Cobalt, Ontario, Canada. Scale: Crystal size 1 mm.
© Reiner Mielke

Pararammelsbergite Crystallography

Axial Ratios:

a:b:c =0.9883:1:1.9559

Cell Dimensions:

a = 5.77, b = 5.838, c = 11.419, Z = 8; V = 384.65 Den(Calc)= 7.20

Crystal System:

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

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

By Intensity(I/I_o): 2.559(1), 2.521(0.95), 2.371(0.65),

Forms:

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Forms: [ 1 1 3] [ 3 0 4] [ 1 1 2] [ 1 0 4] [ 0 0 1]

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Crystal Structure:

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Fleet M E , American Mineralogist , 57 (1972) p.1-9, The crystal structure of pararammelsbergite (NiAs2)

Physical Properties of Pararammelsbergite

Cleavage:

[001] Perfect

Color:

Silver white, Tarnished white.

Density:

7.2

Diaphaniety:

Opaque

Fracture:

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

Habit:

Arborescent - "Tree like" growths of branched systems (e.g. silver).

Habit:

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

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

grayish black

Optical Properties of Pararammelsbergite

RL Anisotrophism:

Strong, in russet-brown, brown, yellow, gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Pararammelsbergite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	59.10	58.70
420 nm	59.30	58.80
440 nm	59.50	58.90
460 nm	59.70	59.20
480 nm	59.70	59.50
500 nm	59.50	59.60
520 nm	59.20	59.80
540 nm	58.90	59.90
560 nm	58.50	60.00
580 nm	58.20	60.00
600 nm	58.00	60.10
620 nm	57.80	60.20
640 nm	57.80	60.30
660 nm	57.70	60.60
680 nm	57.80	60.80
700 nm	58.00	61.20

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

Calculated Properties of Pararammelsbergite

Electron Density:

r_electron=6.49 gm/cc
note: r_{Pararammelsbergite}=7.20 gm/cc.

Fermion Index

Fermion Index = 0.00318
Boson Index = 0.99682

Photoelectric:

PE_{Pararammelsbergite}= 63.48 barns/electron
U=PE_{Pararammelsbergite} x r_electron= 412.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pararammelsbergite is Not Radioactive

Pararammelsbergite Classification

Dana Class:

2.12.5.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.5)Dana Group

2.12.5.1 Pararammelsbergite NiAs2 Pbma 2/m 2/m 2/m

2.12.5.2 Paxite CuAs2 P 2₁/c 2/m

Strunz Class:

II/D.24-20 II - Sulfides and sulphosalts

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

II/D.24 - Clinosafflorite - Paracostibite series

II/D.24-10 Clinosafflorite (Co,Fe,Ni)As2 P 2₁/n 2/m

II/D.24-20 Pararammelsbergite NiAs2 Pbma 2/m 2/m 2/m

II/D.24-30 Paracostibite CoSbS P bca 2/m 2/m 2/m

Other Pararammelsbergite Information

References:

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

See Also:

Links to other databases for Pararammelsbergite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Pararammelsbergite

NiAs2
Dana No: 2.12.5.1 Strunz No: II/D.24-20
Locality:

Notes: