Geology Reference
In-Depth Information
10. Mineralisation/Geotechnical
9. Magma Mixing & Mingling
8. Mafic Complexes
7. Granitic Complexes
6. Shallow-level Intrusions
Table 10.1
(continued)
Mineral
Chemical
Usual colour
Lustre
Usual form
Hardness
Density
×
10
-3
kg m
-3
)
formula
and streak
(
Sphalerite
ZnS
Yellow-brown, good
crystals sometimes black;
yellow-brown streak
Resinous
Massive, but occasional
fibrous or cubic crystals
3.5 - 4.0
3.9 - 4.2
Wolfram
FeWO
4
Black, sometimes dark
brown often associated
with scheelite; dark
yellow-brown streak
Sub-metallic
Tabular, often forms
striated, bladed crystals
5.0 - 5.5
7.1 - 7.5
