Anapaite

Anapaite
240px Anapaite from Ukraine
General
Category	Phosphate minerals
Formula (repeating unit)	Ca2Fe2+(PO4)2·4H2O
Strunz classification	08.CH.10
Crystal symmetry	Triclinic pinacoidal H-M symbol: 1 Space group: P1
Unit cell	a = 6.447 Å, b = 6.816 Å, c = 5.898 Å; α = 101.64°, β = 104.24°, γ = 70.76°; Z=1
Identification
Color	Green, greenish white to colorless
Crystal habit	Tabular to bladed crystals, radiating clusters, incrustations, fibrous, and in nodules
Crystal system	Triclinic
Cleavage	Perfect on {001}, distinct on {010}
Tenacity	Flexible
Mohs scale hardness	3.5
Luster	Vitreous
Streak	White
Diaphaneity	Transparent
Specific gravity	2.8
Optical properties	Biaxial (+)
Refractive index	nα=1.602, nβ=1.613, nγ=1.649
Birefringence	δ = 0.047
Pleochroism	Not visible
2V angle	Measured: 52° to 56°
References

Anapaite is a calcium–iron phosphate mineral with formula: Ca₂Fe²⁺(PO₄)₂·4H₂O. It is a mineral that typically occurs in cavities in fossil bearing sedimentary rocks. It is also found in phosphate bearing iron ores and rarely in pegmatites. It is commonly found with goethite, siderite and vivianite.

It was named after the type locality on the Black Sea coastal region of Anapa, Taman Peninsula, Russia. Noted localities include Kertch (Crimea, Ukraine) and Bellver de Cerdanya (Girona, Catalonia, Spain).

See also

• A list of minerals with associated Wikipedia articles