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Formula: Pb6-3xBi2+xS9
Sulphosalt, lillianite homologous series group,
bismuth-bearing mineral
Crystal System: Monoclinic
Specific gravity: 7.33 calculated
Hardness: 3½
Streak: Lead-grey
Colour: Lead-grey
Environments
Metamorphic environments
Hydrothermal environments
Aschamalmite is apparently only stable at temperatures below 350°C.
Common associates include albite,
calcite, chlorite group
minerals, cosalite, galena,
orthoclase and quartz
(Mindat).
Localities
At the type locality, Ascham Alp - southeast of, Ascham Alp - Breitfuß - Sonntagskopf area, Neukirchen am
Großvenediger, Zell am See District, Salzburg, Austria, aschamalmite is found in mineralised, alpine-cleft
veins cutting through gneiss, associated with
quartz, albite,
adularia, calcite,
chlorite and galena.
The aschamalmite occurs as lead-grey, lathlike crystals to 5 cm in length or thick, slightly bent plates up
to 1 cm2. Most crystals are heavily altered to a mixture of
bismutite and other as yet unidentified phases. Exsolution lamellae of
galena and cosalite are commonly
present
(AM 69.810-815).
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