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Protochabourneite - Sant'Olga tunnel - Monte Arsiccio mine - Sant'Anna di Stazzema - Stazzema - Apuan Alps - Lucca prov. - Tuscany - Italy (TL)
(#:MINS8946)
Dark grey metallic Protochabournéite in sub.mm xls on matrix from the type locality.
Formula :
Tl4-xPb2+2xSb20-x-yAsyS34 with 0.02(2) < x < 0.34(2), 5.71(9) < y < 6.69(9)
System:
triclinic
Hardness:
2½-3
Rarity:
very rare
Strunz id:II/E.14-50 - SULFIDES
Name origin:
For its relation to chabournéite. The "proto" prefix is meant to convey that this species has a primitive unit cell (i.e. a subcell of chabournéite).
Specimen weight:20 gr.
Crystal size:< 1 mm
Overall size: 38mm x 30 mm x 12 mm
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