Anapaite

Hydrous phosphate mineral
(repeating unit)Ca2Fe2+(PO4)2·4H2OIMA symbolAnp[1]Strunz classification8.CH.10Crystal systemTriclinicCrystal classPinacoidal (1)Space groupTriclinic
H-M symbol: (1)
Space group: P1Unit cella = 6.447, b = 6.816
c = 5.898 [Å]; α = 101.64°
β = 104.24°, γ = 70.76°; Z = 1IdentificationColorGreen, greenish white to colorlessCrystal habitTabular to bladed crystals, radiating clusters, incrustations, fibrous, and in nodulesCleavagePerfect on {001}, distinct on {010}TenacityFlexibleMohs scale hardness3.5LusterVitreousStreakWhiteDiaphaneityTransparentSpecific gravity2.8Optical propertiesBiaxial (+)Refractive indexnα=1.602, nβ=1.613, nγ=1.649Birefringenceδ = 0.047PleochroismNot visible2V angleMeasured: 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

References

Wikimedia Commons has media related to Anapaite.
  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. ^ a b c 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.


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