Mineralogy Database

Alloclasite Mineral Data

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General Alloclasite Information

Help on Chemical  Formula: Chemical Formula: (Co,Fe)AsS
Help on Composition: Composition: Molecular Weight = 165.15 gm
   Iron      8.45 %  Fe
   Cobalt   26.76 %  Co
   Arsenic  45.37 %  As
   Sulfur   19.42 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Co0.75Fe2+0.25AsS
Help on Environment: Environment: In calcite or quartz veins of apparently low temperature, late stage hydrothermal origin. Also in silicified, recrystallized metamorphic rock.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1866
Help on Locality: Locality: In the Elizabeth mine, Oravita (Oravicza), Romania. From the Silverfields mine, Cobalt, and the Siscoe mine, Miller Lake, Gowganda, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "other", and "to break," because its cleavage was believed to be different from marcasite, which it resembles.
Help on Name Pronunciation: Name Pronunciation: Alloclasite + Pronunciation Say ALLOCLASITE
Help on Synonym: Synonym: ICSD 36395
  PDF 25-246
 

Alloclasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8316:1:0.6091
Help on Cell Dimensions: Cell Dimensions: a = 4.662, b = 5.606, c = 3.415, Z = 2; V = 89.25 Den(Calc)= 6.14
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 22121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.75(1), 2.47(0.9), 1.82(0.7),
 

Physical Properties of Alloclasite

Help on Cleavage: Cleavage: {101} Perfect, {010} Distinct
Help on Color: Color: Steel gray.
Help on Density: Density: 6.17
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Alloclasite

Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Alloclasite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   47.20   49.20 
   
 420 nm   47.50   49.60 
 440 nm   47.80   50.00 
 460 nm   48.20   50.40 
 480 nm   48.70   50.90 
 500 nm   49.10   51.30 
 520 nm   49.40   51.50 
 540 nm   49.30   51.50 
 560 nm   49.10   51.30 
 580 nm   48.70   51.00 
 600 nm   48.10   50.60 
 620 nm   47.60   50.10 
 640 nm   47.20   49.80 
 660 nm   46.90   49.50 
 680 nm   46.70   49.20 
 700 nm   46.60   49.00 
Calculated Relative Intensity Colors of Alloclasite in Air
Relative
Intensity
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%
R1                      
R2                      
 

Calculated Properties of Alloclasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.63 gm/cc
note: Specific Gravity of Alloclasite =6.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0032484804
Boson Index = 0.9967515196
Help on Photoelectric: Photoelectric: PEAlloclasite = 45.20 barns/electron
U=PEAlloclasite x rElectron Density= 254.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alloclasite is Not Radioactive
 

Alloclasite Classification

Help on  Dana Class: Dana Class: 02.12.06.02 (02)Sulfides - Including Selenides and Tellurides
  (02.12)where Am Bn Xp, with (m+n):p=1:2
  (02.12.06)Dana Group
 
02.12.06.01 Glaucodot (Co,Fe)AsS C mmm 2/m 2/m 2/m
 
02.12.06.02 Alloclasite (Co,Fe)AsS P 22121 2 2 2
Help on  Strunz Class: Strunz Class: 02.EB.10b 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.10b Alloclasite (Co,Fe)AsS P 22121 2 2 2
 

Other Alloclasite Information

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

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

Alloclasite

(Co,Fe)AsS
Dana No: 02.12.06.02 Strunz No: 02.EB.10b
Locality:

 

Notes:

 

 
   
 


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