Weilite
(repeating unit)CaHAsO4 IMA symbol Wei[1] Strunz classification 8.AD.10 Crystal system Triclinic Crystal class Pinacoidal (1)
(same H-M symbol) Space group P1 Unit cell a = 7.059 Å, b = 6.891 Å
c = 7.201 Å; α = 97.43°
β = 103.55°, γ = 87.75°; Z = 4 Identification Color White Crystal habit Powdery, massive Fracture Irregular/uneven Tenacity Brittle Luster Waxy, greasy, dull Streak White Diaphaneity Translucent Specific gravity 3.48 Optical properties Biaxial (-) Refractive index nα = 1.644 nγ = 1.688 Birefringence δ = 0.044 2V angle Measured: 81° References [2][3][4]
(same H-M symbol)
c = 7.201 Å; α = 97.43°
β = 103.55°, γ = 87.75°; Z = 4
Weilite (CaHAsO4) is a rare arsenate mineral. It is a translucent white triclinic mineral with a waxy luster.[2]
It was first described in 1963 for occurrences in Gabe Gottes Mine, Haut-Rhin, Alsace, France; Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany; and the Schneeberg District, Erzgebirge, Saxony, Germany. It is named after French mineralogist René Weil of the University of Strasbourg.[2] It occurs in the oxidized zone of arsenic-bearing hydrothermal veins. It occurs as an alteration product of pharmacolite and haidingerite.[3][4]
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 c Mindat.org
- ^ a b Handbook of Mineralogy
- ^ a b Webmineral data
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