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Erythrite Mineral Data + |
General Erythrite Information |
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| Co3(AsO4)2·8(H2O) | |||
| 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 | |||
| Co3(AsO4)2·8(H2O) | |||
| Secondary mineral in cobalt-bearing deposits | |||
| Valid Species (Pre-IMA) 1832 | |||
| Grube Daniel, Schneeberg, Germany. Link to MinDat.org Location Data. | |||
| Named from the Greek, erythros for "red." | |||
| Cobalt Bloom | |||
| ICSD 81385 | |||
| PDF 33-413 | |||
Erythrite Image | |||
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Erythrite Crystallography |
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| a:b:c =0.7629:1:0.3545 | |||
| a = 10.2, b = 13.37, c = 4.74, Z = 2; beta = 105.016° V = 624.34 Den(Calc)= 3.18 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m | |||
| By Intensity(I/Io): 6.72(1), 3.003(0.47), 3.227(0.42), | |||
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Physical Properties of Erythrite |
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| [010] Perfect | |||
| Colorless, Violet red, Light pink, Purple red. | |||
| 3.06 - 3.18, Average = 3.12 | |||
| Transparent to subtranslucent | |||
| Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). | |||
| Divergent - Crystals radiate from a center without producing stellar forms. | |||
| Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | |||
| Striated - Parallel lines on crystal surface or cleavage face. | |||
| 1.5-2 - Talc-Gypsum | |||
| None. | |||
| Pearly | |||
| pinkish red | |||
Optical Properties of Erythrite |
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| 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 |
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| 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. | |||
| pale pink. | |||
| pale violet. | |||
| red. | |||
Calculated Properties of Erythrite |
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relectron=3.03 gm/cc |
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| Fermion Index = 0.0002 Boson Index = 0.9998 |
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PEErythrite = 26.70 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Erythrite is Not Radioactive |
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Erythrite Classification |
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| 40.3.6.3 (40)Hydrated Phosphates, etc | |||
| (40.3)where (A++)3 (XO4)2 · x(H2O) | |||
| (40.3.6)Dana Group | |||
| VII/C.13-70 VII - Phosphates, Arsenates and Vanadates | |||
| VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg | |||
| VII/C.13 - Vivianite group | |||
Other Erythrite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| 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 - Applied Mineralogy 6 -Athena 7 - Crocoite.com Mineral Locations 8 - Franklin Minerals(Dunn) 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 -QUT Mineral Atlas 18 - Scandinavian mineral gallery 19 - WWW-MINCRYST 20 - YupRocks Search for Erythrite using: Visit our Advertisers for Erythrite : Translate Erythrite Mineral Data : Ask about Erythrite here : Print or Cut-and-Paste your Erythrite Specimen Label here :
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