Erythrite is a secondary hydrated arsenate of cobalt minerals with the formula (Co₃(AsO₄)₂·8H₂O). Erythrite and annabergite (Ni₃(AsO₄)₂·8H₂O) (nickel arsenate) form a complete series with the general formula (Co,Ni)₃(AsO₄)₂·8H₂O. General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9, 4, d Appearance metallic with gray tinge Atomic mass 58. ... Minerals are natural compounds formed through geological processes. ... General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ...

Hardness: 1.5-2.5 on the Mohs scale of hardness.
Luster: (In crystals) Adamantine to vitreous, but pearly on cleavage. (As a crust) Earthy.
Specific Gravity: 3.06.
Cleavage: {010} Perfect.
Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ...

Erythrite crystallizes in the monoclinic system and forms prismatic crystals. The color is crimson to pink and occurs as a secondary coating known as cobalt bloom on cobalt arsenide minerals. Well-formed crystals are rare, with most of the mineral manifesting in crusts or small reniform aggregates. In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ...

Erythrite takes its name from the Greek erythros, meaning red. Historically, erythrite itself has not been an economically important mineral, but the prospector may use it as a guide to associated cobalt and native silver. Erythrite has also been used to color glass. Red is any of a number of similar colors at the lowest frequencies of light discernible by the human eye. ... General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9, 4, d Appearance metallic with gray tinge Atomic mass 58. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... This article refers to the material. ...

Notable localities are Cobalt, Ontario , Schneeberg, Saxony, Germany, and Bou Azzer, Morocco, discovered in 2000. Cobalt is a town in the district of Timiskaming, province of Ontario, Canada, with a population of 1,221, and an area of 2. ...

Other varieties

The nickel variety, annabergite, occurs as a light green nickel bloom on nickel arsenides. In addition iron, magnesium and zinc can also substitute for the cobalt position, creating three other minerals: parasymplesite (Fe), hornesite (Mg), and kottigite (Zn). Also vivianite, a rare mineral which is a weathering product of primary iron-manganese phosphates in pegmatites. Annabergite is a mineral consisting of a hydrous nickel arsenate, Ni3(AsO4)2 + 8H2O, crystallizing in the monoclinic system and isomorphous with vivianite and erythrite. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number zinc, Zn, 30 Chemical series transition metals Group, Period, Block 12, 4, d Appearance bluish pale gray Atomic mass 65. ... Vivianite Fe3(PO4)2·8(H2O), hydrated iron phosphate, is a secondary mineral found in a number of geological environments. ...

References

• Dana's Manual of Mineralogy ISBN 0471032883
• Manual of Mineral Science, 22nd Ed. C. Klein.ISBN 0471251771
• mindat.org
• Webmineral.com