Erythrite Mineral Data

Erythrite Mineral Data +

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General Erythrite Information

Chemical Formula:

Co3(AsO4)2·8(H2O)

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

Empirical Formula:

Co₃(AsO₄)₂·8(H₂O)

Environment:

Secondary mineral in cobalt-bearing deposits

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Grube Daniel, Schneeberg, Germany. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek, erythros for "red."

Synonym:

Cobalt Bloom

ICSD 81385

PDF 33-413

Erythrite Image

Images:

Erythrite Cobaltkoritnigite

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

Images:

Erythrite Skutterudite

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

Erythrite Crystallography

Axial Ratios:

a:b:c =0.7629:1:0.3545

Cell Dimensions:

a = 10.2, b = 13.37, c = 4.74, Z = 2; beta = 105.016° V = 624.34 Den(Calc)= 3.18

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 6.72(1), 3.003(0.47), 3.227(0.42),

Forms:

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Crystal Structure:

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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

Cleavage:

[010] Perfect

Color:

Colorless, Violet red, Light pink, Purple red.

Density:

3.06 - 3.18, Average = 3.12

Diaphaniety:

Transparent to subtranslucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Divergent - Crystals radiate from a center without producing stellar forms.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Pearly

Streak:

pinkish red

Optical Properties of Erythrite

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

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.

Pleochroism (x):

pale pink.

Pleochroism (y):

pale violet.

Pleochroism (z):

red.

Calculated Properties of Erythrite

Electron Density:

r_electron=3.03 gm/cc
note: r_Erythrite=3.12 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

PE_Erythrite= 26.70 barns/electron
U=PE_Erythrite x r_electron= 80.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Erythrite is Not Radioactive

Erythrite Classification

Dana Class:

40.3.6.3 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.6)Dana Group

40.3.6.1 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.2 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.3 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.4 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.5 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.6 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.7 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.8 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

40.3.6.9 IMA2004-021! Co3(PO4)2·8(H2O) C 2/m 2/m

Strunz Class:

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

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite! Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

Other Erythrite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Erythrite

Co3(AsO4)2·8(H2O)
Dana No: 40.3.6.3 Strunz No: VII/C.13-70
Locality:

Notes: