Mineralogy Database

Pararammelsbergite Mineral Data

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General Pararammelsbergite Information

Help on Chemical  Formula: Chemical Formula: NiAs2
Help on Composition: Composition: Molecular Weight = 208.53 gm
   Nickel   28.14 %  Ni
   Arsenic  71.86 %  As
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: NiAs2
Help on Environment: Environment: In hydrotherma veins bearing Ni-Co mineralization. Trimorphous with rammelsbergite and krutovite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1940
Help on Locality: Locality: Gowganda, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, para -"similar" and the mineral Rammelsbergite named after the German chemist and mineralogist, K. F. Rammelsberg (1813-1899).
Help on Name Pronunciation: Name Pronunciation: Pararammelsbergite + Pronunciation Say PARARAMMELSBERGITE
Help on Synonym: Synonym: ICSD 24204
  PDF 18-876
 

Pararammelsbergite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9883:1:1.9559
Help on Cell Dimensions: Cell Dimensions: a = 5.77, b = 5.838, c = 11.419, Z = 8; V = 384.65 Den(Calc)= 7.20
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.559(1), 2.521(0.95), 2.371(0.65),
Help on Forms: Forms:

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Help on Above

Forms: ( 1 1 3) ( 3 0 4) ( 1 1 2) ( 1 0 4) ( 0 0 1)

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Physical Properties of Pararammelsbergite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Silver white, Tarnished white.
Help on Density: Density: 7.2
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Arborescent - "Tree like" growths of branched systems (e.g. silver).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Pararammelsbergite

Help on RL Anisotrophism: RL Anisotrophism: Strong, in russet-brown, brown, yellow, gray.
Help on Reflectivity 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.49 gm/cc
note: Specific Gravity of Pararammelsbergite =7.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0031802946
Boson Index = 0.9968197054
Help on Photoelectric: Photoelectric: PEPararammelsbergite = 63.48 barns/electron
U=PEPararammelsbergite x rElectron Density= 412.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pararammelsbergite is Not Radioactive
 

Pararammelsbergite Classification

Help on  Dana Class: Dana Class: 02.12.05.01 (02)Sulfides - Including Selenides and Tellurides
  (02.12)where Am Bn Xp, with (m+n):p=1:2
  (02.12.05)Dana Group
 
02.12.05.01 Pararammelsbergite NiAs2 Pbma 2/m 2/m 2/m
 
02.12.05.02 Paxite CuAs2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 02.EB.10e 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.10e Pararammelsbergite NiAs2 Pbma 2/m 2/m 2/m
 
02.EB.10e Paracostibite CoSbS P bca 2/m 2/m 2/m
 

Other Pararammelsbergite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Pararammelsbergite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Pararammelsbergite

NiAs2
Dana No: 02.12.05.01 Strunz No: 02.EB.10e
Locality:

 

Notes:

 

 
   
 


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