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Co3(AsO4)2 · 8H2O
Crimson to peach red, ...
1½ - 2½
Member of:
Named in 1832 by Francois Sulpice Beaudant From the Greek έρυθρος for red.

Classification of Erythrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5

3 : A3(XO4)2·xH2O

20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni URL:
Please feel free to link to this page.

Type Occurrence of Erythrite

Occurrences of Erythrite

Geological Setting:
A secondary mineral in the oxidation zone of some Ni-Co-As mineral deposits.

Physical Properties of Erythrite

Sub-Vitreous, Waxy, Pearly, Dull, Earthy
Diaphaneity (Transparency):
Transparent, Translucent
Pearly on {010} cleavage
Crimson to peach red, pale rose, pink
Grades into paler shades and is still pale rose or pale pink at Co:Ni ~ 1:1. Single crystals might exhibit colour banding or may be tipped by material of a different colour.
Pale red to pink (paler than the colour)
Hardness (Mohs):
1½ - 2½
Softest on {010}.
Perfect on {010}, poor on {100}{102}
Translation gliding:
T{010}, t[001].
Flexible in thin {010} laminae; sectile
3.06 g/cm3 (Measured)    3.135 g/cm3 (Calculated)
3.178 (artificial material).

Crystallography of Erythrite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Space Group Setting:
Cell Parameters:
a = 10.254(3) Å, b = 13.447(4) Å, c = 4.764(1) Å
β = 104.98°
a:b:c = 0.763 : 1 : 0.354
Unit Cell Volume:
V 634.56 ų (Calculated from Unit Cell)
Crystals prismatic to acicular [001] and typically flattened on {010}; deeply striated or furrowed [001]. Also striated on {010} parallel to {h0l} or {_h0l}. Crystals are rare; frequently as radial or stellate groups; globular or reniform shapes with drusy surfaces and columnar or coarse-fibrous structure. Earthy or pulverulent.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
6.65 (100)
7.89 (6)
3.34 (8)
3.22 (12)
2.70 (8)
2.32 (8)
1.677 (14)
ICDD 11-626

Optical Data of Erythrite

Biaxial (+)
RI values:
nα = 1.626 - 1.629 nβ = 1.662 - 1.663 nγ = 1.699 - 1.701
Measured: 85° to 90°, Calculated: 88° to 90°
Max Birefringence:
δ = 0.073
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v
X= paleish pink to pale rose
Y= Pale violet to pale violet-rose
Z= deep red
May be biaxial negative

Chemical Properties of Erythrite

Co3(AsO4)2 · 8H2O
All elements listed in formula:
Common Impurities:

Relationship of Erythrite to other Species

Forms a series with Annabergite (see here)
Forms a series with Hörnesite (see here)
Member of:
Other Members of Group:
AnnabergiteNi3(AsO4)2 · 8H2O
ArupiteNi3(PO4)2 · 8H2O
BabánekiteCu3(AsO4)2 · 8H2O
Barićite(Mg,Fe)3(PO4)2 · 8H2O
HörnesiteMg3(AsO4)2 · 8H2O
KöttigiteZn3(AsO4)2 · 8H2O
Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
PakhomovskyiteCo3(PO4)2 · 8H2O
ParasymplesiteFe32+(AsO4)2 · 8H2O
VivianiteFe32+(PO4)2 · 8H2O
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
8.CE.05GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.20RössleriteMg(HAsO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 8-9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.55KoninckiteFe3+PO4 · 3H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.10.3RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
20.10.4β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
20.10.5WendwilsoniteCa2Mg(AsO4)2 · 2H2O
20.10.6Cobaltkoritnigite(Co,Zn)(HAsO4) · H2O
20.10.9AnnabergiteNi3(AsO4)2 · 8H2O
20.10.10Smolyaninovite(Co,Ni,Mg,Ca)3(Fe3+,Al)2(AsO4)4 · 11H2O

Other Names for Erythrite

Other Information

Other Information:
Soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Erythrite

Reference List:
Bruckmann (1727) Magnalia dei in locis subterraneis, part 1: 161 (as Kobold-Blüthe).

Wallerius, J.G (1747) Mineralogia, eller Mineralriket. Stockholm: 234 (as Kobalt Blomma, Flos Cobalti [crystals], Koboltbeslag [earthy & impure], Cobalti minera colore rubro).

Cronstedt A. (1758) Mineralogie; eller Mineral-Rikets Upstallning. 12mo, Stockholm: 212 (as Koboltblüte, Koboltbeschlag, Ochra Cobalti rubra).

Bergmann, T. (1780) Opuscula of Tobernus Bergmann: 2: 444 (as Cobaltum Acido arsenico mineralisatum).

Bergmann, T. (1782) Sciagraphia regni mineralis. 8vo.: 134 (as Cobaltum Acido arsenico mineralisatum).

Beudant, F.S. (1832), Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 596 (as Erythrine).

Huot, J.J. (1841) Manuel de Minéralogie. 2 volumes, Paris: 1: 313 (as Rhodoise).

Kersten (1843) Annalen der Physik, Halle, Leipzig: 60: 151.

Vogl (1856) Gangverhält. und Min. Joachimsthal, Teplitz.

Petersen (1868) Annalen der Physik, Halle, Leipzig: 134: 86.

Brezina (1872) Mineralogische und petrographische Mitteilungen, Vienna: 19.

Mügge (1884) Jahrbuch für Mineralogie: I: 53.

Genth (1885) Proceeedings of the American Philosophical Society: 23: 46.

Mügge (1898) Jahrbuch für Mineralogie: I: 74.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 817.

de Schulten (1904) Comptes rendus de l’Académie des sciences de Paris: 136: 1444.

Shannon, Green (1910) Transactions of the Canadian Institute, Toronto: 8: 443.

Lincio (1914) Sitzbereicht Heidelberg Ak. Wiss., Math-phys. Kl., Abh.: 15.

Goldschmidt, V. (1918) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 5: 33.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 40, 72.

Ulrich (1926) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 64: 143.

Hintze, Carl (1933) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 1261, 1264.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 120, 178.

Barth (1937) American Mineralogist: 22: 325.

Wolfe (1940) American Mineralogist: 25: 804.

Friedlaender (1942) Verh. Schweiz. naturfor. Ges.: 112.

Sinkler (1942) Economic Geology: 37: 136.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 746-750.

G. H. Faye and E. H. Nickel (1968): The origin of pleochroism in erythrite. Can. Mineral. 9, 493-504.

European Journal of Mineralogy: 8: 187-192.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680 pp.: 159.

R. B. Cook (2007) Connoisseur's choice, erthyrite, Bou Azzer, Morocco. Rocks & Minerals 82:402-407

Internet Links for Erythrite

The following Erythrite specimens are currently listed for sale on

Localities for Erythrite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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