Erythrite Mineral Data

Erythrite Mineral Data +

[Thumbnails] [Miniatures] [Cabinets] [About Us] [FAQ]
Welcome To Mason's Minerals
Your Source for Beautiful Minerals and Crystals
We offer a no-questioned-asked Satisfaction Guarantee

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 0 0] [ 0 1 0] [ 1 2 0] [ 1 0 1] [ 1 1 0] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

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 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery
18 - WWW-MINCRYST
19 - YupRocks

Search for Erythrite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Erythrite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Erythrite Mineral Data :

Ask about Erythrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Erythrite

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

Notes: