Xanthoxenite
(repeating unit)Ca4Fe3+2(PO4)4(OH)2·3H2O IMA symbol Xox[1] Strunz classification 8.DH.40 Crystal system Triclinic Crystal class Pinacoidal (1)
(same H-M symbol) Space group P1 Unit cell a = 6.7 Å, b = 8.85 Å
c = 6.54 Å; α = 92.1°
β = 110.1°, γ = 93.2°; Z = 1 Identification Formula mass 739.95 g/mol Color Pale to brownish yellow Crystal habit Occurs as platy crystals and as lamellar aggregates and crusts Cleavage Perfect {010} Mohs scale hardness 2.5 Luster Earthy (dull) Streak White Diaphaneity Translucent Specific gravity 2.97 measured, 3.38 calculated Optical properties Biaxial (-) Refractive index nα = 1.704 nβ = 1.715 nγ = 1.724 References [2][3][4]
(same H-M symbol)
c = 6.54 Å; α = 92.1°
β = 110.1°, γ = 93.2°; Z = 1
Xanthoxenite is a rare calcium iron(III) phosphate mineral with formula: Ca4Fe3+2(PO4)4(OH)2·3H2O. It occurs as earthy pale to brownish yellow incrustations and lath shaped crystals. It crystallizes in the triclinic crystal system. It occurs as an alteration product of triphylite in pegmatites.[4] It occurs associated with apatite, whitlockite, childrenite–eosphorite, laueite, strunzite, stewartite, mitridatite, amblygonite and siderite.[3]
It has been found in Australia, Brazil, Portugal, Spain, Ukraine, and the United States. It was first described in 1920 for an occurrence in North Groton, Grafton County, New Hampshire.[2]
References
- ^ 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.
- ^ a b Xanthoxenite mineral data on Webmineral
- ^ a b Handbook of Mineralogy
- ^ a b Mindat.org
- v
- t
- e
