Anapaite

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Anapaite
Anapaite-215130.jpg
Anapaite from Ukraine
General
CategoryPhosphate minerals
Formula
(repeating unit)
Ca2Fe2+(PO4)2·4H2O
IMA symbolAnp[1]
Strunz classification8.CH.10
Crystal systemTriclinic
Crystal classPinacoidal (1)
Space groupTriclinic
H-M symbol: (1)
Space group: P1
Unit cella = 6.447, b = 6.816
c = 5.898 [Å]; α = 101.64°
β = 104.24°, γ = 70.76°; Z = 1
Identification
ColorGreen, greenish white to colorless
Crystal habitTabular to bladed crystals, radiating clusters, incrustations, fibrous, and in nodules
CleavagePerfect on {001}, distinct on {010}
TenacityFlexible
Mohs scale hardness3.5
LusterVitreous
StreakWhite
DiaphaneityTransparent
Specific gravity2.8
Optical propertiesBiaxial (+)
Refractive indexnα=1.602, nβ=1.613, nγ=1.649
Birefringenceδ = 0.047
PleochroismNot visible
2V angleMeasured: 52° to 56°
References[2][3][4]

Anapaite is a calciumiron 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) and Valdarno, Tuscany, Italy.

See also[edit]

References[edit]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
  2. ^ a b c Anapaite on Mindat.org
  3. ^ Anapaite data on Webmineral.com
  4. ^ Anapaite in the Handbook of Mineralogy