5 U 
Luigi Bombigci 
Segue GRUPPO I. R 2 S 
1 IIBUoSwSTJ 1 
In 100 molecole di minerale ne sono: 
■r, / POLI BASITE . . 82 Ag*S + 6Cu 2 S,feS 2 , 10(SbAs) 2 S 3 . 
. 70 Ag 9 S -t- 18 Cu 2 S, fe S‘ 2 , lt(SbAs) 2 S 3 . 
t ) PIRARGIRITE. . 76 VS + 24Sb ! S s . 
—7 PROUSTITE . . 75 Ag^S + 24 As 2 S 3 , lSb 2 S 3 . 
XANTOCONO. . 63 Ag* S 3 fe S\ 19 As 2 S 5 , 16 S. 
s 
s 
1 
MI ARG1RITE . . 50 X 9 2 S + 3 Co 2 S, 3 fe S 2 , 44 Sb 2 S. 5 
GRUPPO II. R S 
/CUPROPLUMBITE 65 
[ DUFRENOYSITE. 65 
=-<CLAUSTHALIA . { 79 
T1LKERODITE 
ALTA ITE . 
BLENDA . 
MARMATITE 
alabandina 
SIEPOORITE 
GRCJNAUITE 
LINNAEITE 
SIEGENITE 
PbS. 
P55h 
PbS-\ 
PbS-i 
PbS-i 
PbSe- 
PbSe , 
PbSe 
Pb Te 
ZnS. 
ZnS -1 
MnS. 
CoS. 
JVÌS+ 
CoS + 
NÌS + 
2 fe S 2 . 
8feS 2 , 3Co 2 S, 4ZnS, 5 Sb 2 S 5 . 
34 Cu 2 S, Ag 2 S. 
feS 2 , (Ag 2 S, Cu 2 S), 33 As 2 S 3 . 
• 17 Co 2 Se, 4 fe Se 2 . 
- 11 Co S 2 , fe S 2 . 
- tr. Ag 2 Te . 
24CoS, 12feS 2 ,10Co 2 S,2PbS,4Bi 2 S 3 . 
26 Co S 2 , 8 fe S 2 , 12Cn 2 S. 
19 Co S 2 , 8 fe S 2 , 7 Ni S 2 . 
