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Specimens online:418
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1 - Kammererit (GMi)
2 - Cavansite (GMi)
3 - Hubnerite (GMi)
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25 - Enargite x (Rol)
26 - Brochanite (Rol)
27 - Kinoite xx (Rol)
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30 - Gold xx (Rol)
31 - Euxenite-( (Rol)
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34 - Zinkenite, (Rol)
35 - Boleite (T (Min)
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38 - Allanite-( (Min)
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41 - Onoratoite (Min)
42 - Elbaite (Min)
43 - Goyazite (Min)
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45 - Spinel (Min)
46 - Columbite- (Min)
47 - Kutnohorit (Min)
48 - Fluorite, (Min)
49 - Fluorite, (Min)
50 - Malachite (Min)
51 - Cerrusite (Min)
52 - Rutile (Min)
53 - Leucite wi (Min)
54 - Vesuvianit (Min)
55 - Spessartin (Min)
56 - Quartz var (Min)
57 - Andradite (Rol)
58 - Grossular, (Rol)
59 - Stolzite (Rol)
60 - Offrettite (Rol)

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).