Arsenmarcobaldiite

arsenmarcobaldiite

baryte

muscovite

sphalerite

Images

Formula: Pb₁₂(As_3.2Sb_2.8)_Σ6S₂₁
Sulphosalt, jordanite homologous series group, arsenic-bearing mineral
Crystal System: Triclinic
Specific gravity: 6.44 calculated for the empirical formula
Hardness: about 3
Streak: Black
Colour: Black
Environments

Metamorphic environments

Arsenmarcobaldiite is a relatively new mineral, approved in 2016.

Localities

At the type locality, Verzalla, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy, arsenmarcobaldiite was collected in a small prospect where baryte + pyrite lenses embedded in schist crop out, in an area where metamorphic rocks underlie non-metamorphic sedimentary formations.
Arsenmarcobaldiite was identified in a limited number of samples. The type material is represented by granular quartz layers embedded in pyrite-rich schist, with minor baryte, muscovite and sphalerite. Arsenmarcobaldiite occurs as interstitial anhedral grains, up to 0.5 mm in size, black in colour, with a metallic lustre and a black streak (EJM 31.1067–1077).
Arsenmarcobaldiite from Verzalla - Image

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