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Co3(AsO4)2 · 8H2O
Crimson to peach red, ...
Sub-Vitreous, Waxy, Pearly, Dull, Earthy
1½ - 2½
Member of:
Named in 1832 by François Sulpice Beaudant from the Greek έρυθρος, "erythros" for "red".

Classification of Erythrite

Approved, 'Grandfathered' (first described prior to 1959)

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

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).

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
Elements listed in formula:
Common Impurities:

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

Occurrences of Erythrite

Type Occurrence of Erythrite

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.XBabánekiteCu3(AsO4)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 · 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
20.10.10SmolyaninoviteCo3Fe23+(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.

Erythrite in petrology

Common component of (items highlighted in red)

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) Traité 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) Proceedings 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, C. (1942) Über den Erythrin von Mont-Chemin (Wallis). Verhandlungen der Schweizerischen Naturforschenden Gesellschaft: 122: 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, erythrite, Bou Azzer, Morocco. Rocks & Minerals 82, 402-407.

Capitelli, F., Elaatmani, M., Driss Lalaoui, M. and Piniella, J. F. (2007) Crystal structure of a vivianite-type mineral: Mg-rich erythrite, (Co2.16Ni0.24Mg0.60)(AsO4)2 · 8 H2O. Zeitschrift für Kristallographie - Crystalline Materials, 222, 676-679.

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