Aschamalmite and quartz from Leckbachscharte in Habachtal Salzburg, Austria — Photo: Kritzolina · CC BY-SA 4.0
Aschamalmite
A lead-bismuth sulfosalt first found in Austria's High Tauern.
Intro adapted from Wikipedia (CC BY-SA).
Aschamalmite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₆₋₃ₓBi₂₊ₓS₉.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Lillianite structural group.
Key properties: specific gravity 7.33; Metallic. Anisotropism: Moderate, from gray to red-brown. R1 –R2: (470) 45.1–48.1, (546) 43.4–46.3, (589) 42.9–46.3 luster.
IMA symbol Ahm, IMA status: approved, named in 1982.
Found in alpine veins, cutting gneiss.
It is found associated with Cosalite, galena, quartz, albite, orthoclase, calcite, chlorite.
The name refers to its occurrence at Ascham Alm, Austria.