Erythrite Mineral Data

Erythrite Mineral Data
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General Erythrite Information

Help on Chemical Formula: Chemical Formula: Co3(AsO4)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 598.76 gm
   Cobalt    29.53 %  Co   41.55 % Co2O3
   Arsenic   25.03 %  As   38.39 % As2O5
   Hydrogen   2.69 %  H    24.07 % H2O
   Oxygen    42.75 %  O
            ______        ______ 
            100.00 %      104.01 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Co3(AsO4)2•8(H2O)
Help on Environment: Environment: Secondary mineral in cobalt-bearing deposits
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1832
Help on Locality: Locality: Grube Daniel, Schneeberg, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek, erythros for "red."
Help on Name Pronunciation: Name Pronunciation: Erythrite + Pronunciation Say ERYTHRITE
Help on Synonym: Synonym: Cobalt Bloom
  ICSD 81385
  PDF 33-413
 

Erythrite Image

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Erythrite   Cobaltkoritnigite

Comments: Dark purplish cobaltkoritnigite with pink erythrite.
Location: Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag
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Erythrite   Skutterudite

Comments: Erythrite crystal on massive skutterudite.
Location: Bou Azzer, Morocco. Scale: Crystal size 1.5 cm.
© John Veevaert

Erythrite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7629:1:0.3545
Help on Cell Dimensions: Cell Dimensions: a = 10.2, b = 13.37, c = 4.74, Z = 2; beta = 105.016° V = 624.34 Den(Calc)= 3.18
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.72(1), 3.003(0.47), 3.227(0.42),
Help on Forms: Forms:

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Forms: ( 1 0 0) ( 0 1 0) ( 1 2 0) ( 1 0 1) ( 1 1 0) ( 0 0 1)

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Wildner M , Giester G , Lengauer C L , McCammon C A , European Journal of Mineralogy , 8 (1996) p.187-192, Structure and crystal chemistry of vivianite-type compounds: Crystal, structures of erythrite and annabergite with a Mossbauer study of erythrite

 

Physical Properties of Erythrite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorless, Violet red, Light pink, Purple red.
Help on Density: Density: 3.06 - 3.18, Average = 3.12
Help on Diaphaneity: Diaphaneity: Transparent to subtranslucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Divergent - Crystals radiate from a center without producing stellar forms.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: pinkish red
 

Optical Properties of Erythrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.243 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.257 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2086,KPDmeas= 0.2126,KC= 0.2807
Ncalc = 1.86 - 1.89
Help on Optical Data: Optical Data: Biaxial (+), a=1.626-1.629, b=1.662-1.663, g=1.699-1.701, bire=0.0720-0.0730, 2V(Calc)=88-90, 2V(Meas)=85-90. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): pale pink.
Help on Pleochroism (y): Pleochroism (y): pale violet.
Help on Pleochroism (z): Pleochroism (z): red.
 

Calculated Properties of Erythrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Erythrite =3.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002092565
Boson Index = 0.9997907435
Help on Photoelectric: Photoelectric: PEErythrite = 26.70 barns/electron
U=PEErythrite x rElectron Density= 80.96 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Erythrite is Not Radioactive
 

Erythrite Classification
Help on Dana Class: Dana Class: 40.03.06.03 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 · x(H2O)
  (40.03.06)Vivianite Group
 
40.03.06.01 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
 
40.03.06.02 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
 
40.03.06.03 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.04 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.05 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
 
40.03.06.06 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
 
40.03.06.07 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.08 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
 
40.03.06.09 Pakhomovskyite! Co3(PO4)2•8(H2O) C 2/m 2/m
Help on Strunz Class: Strunz Class: 08.CE.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O £ 1:2.5
 
08.CE.40 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None
 
08.CE.40 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21/c 2/m
 
08.CE.40 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Pakhomovskyite! Co3(PO4)2•8(H2O) C 2/m 2/m
 

Other Erythrite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Erythrite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
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 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery
18 - WWW-MINCRYST
19 - YupRocks

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

Erythrite

Co3(AsO4)2•8(H2O)
Dana No: 40.03.06.03 Strunz No: 08.CE.40
Locality:

 

Notes: