Anapaite

Anapaite
Anapaite
	Anapaite from Ukraine
General
Category	Phosphate minerals
Formula	Ca2Fe2+(PO4)2·4H2O
IMA symbol	Anp
Strunz classification	8.CH.10
Crystal system	Triclinic
Crystal class	Pinacoidal (1)
Space group	Triclinic ; H-M symbol: (1) ; Space group: P1
Unit cell	a = 6.447, b = 6.816 ; 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
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.^[2]

Quick Facts General, Category ...

It was named after the type locality on the Black Sea coastal region of Anapa, Taman Peninsula, Russia.^[2] Noted localities include Kertch (Crimea, Ukraine), Bellver de Cerdanya (Lleida, Catalonia, Spain)^[5] and Valdarno, Tuscany, Italy.

See also