| Weilite | |
| Category: | Arsenate mineral |
| Formula: | CaHAsO4 |
| Imasymbol: | Wei[1] |
| Strunz: | 8.AD.10 |
| System: | Triclinic |
| Class: | Pinacoidal (same H-M symbol) |
| Symmetry: | P |
| 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 |
| Color: | White |
| Habit: | Powdery, massive |
| Fracture: | Irregular/uneven |
| Tenacity: | Brittle |
| Luster: | Waxy, greasy, dull |
| Streak: | White |
| Diaphaneity: | Translucent |
| Gravity: | 3.48 |
| Opticalprop: | Biaxial (-) |
| Refractive: | nα = 1.644 nγ = 1.688 |
| Birefringence: | δ = 0.044 |
| 2V: | Measured: 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]