Weilite

Weilite
Weilite (white) with pink erythrite from Richelsdorf District, Wildeck, Hesse, Germany
General
CategoryArsenate mineral
Formula
(repeating unit)		CaHAsO4
IMA symbolWei[1]
Strunz classification8.AD.10
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 7.059 Å, b = 6.891 Å
c = 7.201 Å; α = 97.43°
β = 103.55°, γ = 87.75°; Z = 4
Identification
ColorWhite
Crystal habitPowdery, massive
FractureIrregular/uneven
TenacityBrittle
LusterWaxy, greasy, dull
StreakWhite
DiaphaneityTranslucent
Specific gravity3.48
Optical propertiesBiaxial (-)
Refractive indexnα = 1.644 nγ = 1.688
Birefringenceδ = 0.044
2V angleMeasured: 81°
References[2][3][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

  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 Mindat.org
  3. ^ a b Handbook of Mineralogy
  4. ^ a b Webmineral data


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