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).
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