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

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

Pronounciation of ErythriteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ErythriteHide

Sub-Vitreous, Waxy, Pearly, Dull, Earthy
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)
1½ - 2½ on Mohs scale
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 ErythriteHide

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 ErythriteHide

Co3(AsO4)2 · 8H2O
Common Impurities:

Crystallography of ErythriteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
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 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 DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
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

Type Occurrence of ErythriteHide

Synonyms of ErythriteHide

Other Language Names for ErythriteHide

Varieties of ErythriteHide

Mg-rich ErythriteSolid-solution member, with optical data intermediate between those of Erythrite and Hörnesite.
Originally reported from Magnesite Mine, Millstätter Alpe Mt., Radenthein, Gurktaler Alpen Mts, Carinthia, Austria.

Relationship of Erythrite to other SpeciesHide

Member of:
Other Members of this group:
AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
BabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
Forms a series with:

Common AssociatesHide

MorenositeNiSO4 · 7H2O
RetgersiteNiSO4 · 6H2O
ScoroditeFe3+AsO4 · 2H2O
SymplesiteFe2+3(AsO4)2 · 8H2O
Associated Minerals Based on Photo Data:
Quartz113 photos of Erythrite associated with Quartz on
Silver54 photos of Erythrite associated with Silver on
Skutterudite50 photos of Erythrite associated with Skutterudite on
Conichalcite39 photos of Erythrite associated with Conichalcite on
Azurite33 photos of Erythrite associated with Azurite on
Smolyaninovite26 photos of Erythrite associated with Smolyaninovite on
Phlogopite26 photos of Erythrite associated with Phlogopite on
Tyrolite25 photos of Erythrite associated with Tyrolite on
Calcite25 photos of Erythrite associated with Calcite on
Cobaltite20 photos of Erythrite associated with Cobaltite on

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2OMon.
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide · 8H2OMon. 2/m : B2/mćite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m · 8H2OMon. 2/m : B2/möttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m · 8H2OMon. 2/m : B2/mörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m · 8H2OMon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.10.2CobaltaustiniteCaCo(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.10.3RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
20.10.4β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.
20.10.5WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
20.10.6Cobaltkoritnigite(Co,Zn)(HAsO4) · H2OTric. 1 : P1
20.10.7AerugiteNi8.5(AsO4)2As5+O8Mon. 2/m : B2/m
20.10.8XanthiositeNi3(AsO4)2Mon. 2/m : P21/b
20.10.9AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.10.10SmolyaninoviteCo3Fe3+2(AsO4)4 · 11H2OOrth.
20.10.11NickelaustiniteCaNi(AsO4)(OH)Orth. 2 2 2 : P21 21 21

Other InformationHide

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 petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for ErythriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for ErythriteHide

Localities for ErythriteHide

This 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.

Locality ListShow

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