Measurements: 43 x 35 x 35 mm
Description:
Clear smithsonite crystals up to about 5 mm wide with
small, black inclusions (probably related to the matrix) sit on and in
a dark
grey / blackish (heavy) metallic chalcocite matrix. The smithsonite
crystals are
well
formed and the combination of clear and dark grey / black makes for a
lovely
specimen.
Only a few of the crystals have minute to small nicls.
Weight of
Specimen: 62.9
g
Chemical Composition:
ZnCO3 (basic
smithsonite formula)
Cu2S (chalcocite)
Hardness
on Mohs Scale: (smithsonite) 4
- 4.5
(chalcocite)
2.5 - 3
Location: Tsumeb,
Specimen
Code: NTS 021
US
$ 170
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