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Formula: Pb12(As3.2Sb2.8)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
Arsenmarcobaldiite is a relatively new mineral, approved in 2016 and to date (February 2024) reported only
from the type locality.
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).
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