Anapaite

Anapaite
Anapaite from Ukraine
General
Category	Phosphate minerals
Formula (repeating unit)	Ca2Fe^2+(PO4)2·4H2O
IMA symbol	Anp[1]
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	[2][3][4]

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]

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

• A list of minerals with associated Wikipedia articles
• List Viewing (in German)

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. Anapaite on Mindat.org
3. Anapaite data on Webmineral.com
4. Anapaite in the Handbook of Mineralogy
5. Calvo, Miguel (2015). Minerales y Minas de España. Vol. VII. Fosfatos, Arseniatos y Vanadatos (in Spanish). Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. pp. 319–321.