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Erythrite

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Formula:
Co
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
System:MonoclinicColour:Crimson to peach red, ...
Hardness:1½ - 2½
Member of:Vivianite Group
Name:Named in 1832 by Francois Sulpice Beaudant From the Greek έρυθρος for red.

Classification of Erythrite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.13-70
Nickel-Strunz 10th (pending) edition ID:8.CE.40

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th edition ID:40.3.6.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
Hey's CIM Ref.:20.10.1

20 : Arsenates (also arsenates with phosphate, but without other anions)
10 : Arsenates of Co and Ni
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Type Occurrence of Erythrite

Type Locality:Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Occurrences of Erythrite

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

Physical Properties of Erythrite

Lustre:Sub-Vitreous, Waxy, Pearly, Dull, Earthy
Diaphaneity (Transparency):Transparent, Translucent
Comment:Pearly on {010} cleavage
Colour:Crimson to peach red, pale rose, pink
Comment: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.
Streak:Pale red to pink (paler than the colour)
Hardness (Mohs):1½ - 2½
Comment:Softest on {010}.
Tenacity:Sectile
Cleavage:Perfect
Perfect on {010}, poor on {100}{102}
Translation gliding:T{010}, t[001].
Comment:Flexible in thin {010} laminae; sectile
Density (measured):3.06 g/cm3
Density (calculated):3.135 g/cm3
Comment:3.178 (artificial material).

Crystallography of Erythrite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m
Space Group Setting:C2/m
Cell Parameters:a = 10.254(3) Å, b = 13.447(4) Å, c = 4.764(1) Å
β = 104.98°
Ratio:a:b:c = 0.763 : 1 : 0.354
Unit Cell Volume:V 634.56 ų (Calculated from Unit Cell)
Z:2
Morphology: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:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
d-spacingIntensity
6.65 (100)
7.89 (6)
3.34 (8)
3.22 (12)
2.70 (8)
2.32 (8)
1.677 (14)
Comments:ICDD 11-626

Optical Data of Erythrite

Type:Biaxial (+)
RI values: nα = 1.626 - 1.629 nβ = 1.662 - 1.663 nγ = 1.699 - 1.701
2V:Measured: 85° to 90°, Calculated: 88° to 90°
Maximum Birefringence:δ = 0.073

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v
Pleochroism:Visible
Comments:X= paleish pink to pale rose
Y= Pale violet to pale violet-rose
Z= deep red
Comments:May be biaxial negative

Chemical Properties of Erythrite

Formula:
Co
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Simplified for copy/paste:Co3(AsO4)2·8H2O
Essential elements:As, Co, H, O
All elements listed in formula:As, Co, H, O
Common Impurities:Ni,Fe,Zn

Relationship of Erythrite to other Species

Series:Forms a series with Annabergite (see here)
Forms a series with Hörnesite (see here)
Member of:Vivianite Group
Other Members of Group:

- +
Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Arupite
Ni
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Babánekite
Cu
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Pakhomovskyite
Co
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
Vivianite
Fe
2+
3
(PO
 
4
)
 
2
· 8H
 
2
O
Common Associates:
SymplesiteSkutteruditeScoroditeRetgersiteMorenosite
MalachiteCobaltiteAdamite
Related Minerals - Nickel-Strunz Grouping):

- +
8.CE.05Chudobaite
(Mg,Zn)
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.05Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.10Newberyite
Mg(HPO
 
4
) · 3H
 
2
O
8.CE.15Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
8.CE.20Phosphorrösslerite
Mg(HPO
 
4
) · 7H
 
2
O
8.CE.20Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
· 7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 8-9H
 
2
O
8.CE.30Ondrušite
CaCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
8.CE.30Veselovskýite
ZnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
8.CE.30Klajite
MnCu
 
4
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9-10H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
· 8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
· 22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
PO
 
4
· 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
· 3.5H
 
2
O
8.CE.65Steigerite
Al(VO
 
4
) · 3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 6H
 
2
O
8.CE.70Schoderite
Al
 
2
(PO
 
4
)(VO
 
4
) · 8H
 
2
O
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Zigrasite
MgZr(PO
 
4
)
 
2
· 4H
 
2
O
8.CE.75Unnamed (Ca-analogue of Zigrasite)
CaZr[PO
 
4
]
 
2
· 4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
(PO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
· 8(H
 
2
O,OH)
Related Minerals - Hey's Index Grouping:

- +
20.10.2Cobaltaustinite
CaCo(AsO
 
4
)(OH)
20.10.3Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
20.10.4β-Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
20.10.5Wendwilsonite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
20.10.6Cobaltkoritnigite
(Co,Zn)(HAsO
 
4
) · H
 
2
O
20.10.7Aerugite
Ni
 
8.5
(AsO
 
4
)
 
2
As
5+
 
O
 
8
20.10.8Xanthiosite
Ni
 
3
(AsO
 
4
)
 
2
20.10.9Annabergite
Ni
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.10.10Smolyaninovite
(Co,Ni,Mg,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(AsO
 
4
)
 
4
· 11H
 
2
O
20.10.11Nickelaustinite
Ca(Ni,Zn)(AsO
 
4
)(OH)

Other Names for Erythrite

Synonyms:
Arsenate of CobaltCobalt bloomCobalt crustCobalt-micaCobalt Ocher
Erythrite (of Beudant)Red CobaltRed cobalt ochreRhodoial
Other Languages:
Catalan:Eritrina
Dutch:Erythriet
French:érythrite
Cobalt arseniaté
Erythrine
Rhodoîse
German:Erythrin
Erythrit
Kobaltblüte
Kobold-Blüthe
Koboltbeschlag
Koboltblüthe
Rhodoit
Hungarian:Eritrin
Italian:Eritrite
Latin:Cobalti minera colore rubro
Cobaltum Acido arsenico mineralisatum
Flos Kobalti
Ochra Cobalti rubra
Polish:Erytryn
Russian:Эритрин
Simplified Chinese:钴华
Slovak:Erytrit
Spanish:Eritrina
Erythrita
Swedish:Koboltbeslag
Kobolt Blomma
Ukrainian:Еритрин
Varieties:
Mg-rich Erythrite

Other Information

Other Information:Soluble in acids.
Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Erythrite details from Handbook of Mineralogy (PDF)
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    Localities for Erythrite

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