Danielsite

General Information:
 Chemical Formula:
(Cu,Ag)14HgS8
 Composition:
(Molecular Weight = 1,524.05 gm)
Copper 41.70 % Cu
Silver 28.31 % Ag
Mercury 13.16 % Hg
Sulfur 16.83 % S 
 Empirical Formula:
Cu10Ag4HgS8
 IMA Status:
Approved IMA
 Locality:
Coppin Pool, WA, Australia.
 Name Origin:
Named for John L. Daniels (1931-), who collected the mineral.
Physical Properties:
 Color:
gray or steel gray.
 Diaphaniety:
Opaque
 Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
 Hardness:
2-2.5 - Gypsum-Finger Nail
 Luster:
Metallic
More details...