General Information:
Chemical Formula:
(Mn,Fe++,Mg)(Al,Fe+++)2O4
Locality:
Bald Knob near the town of Galax, Alleghany co., North Carolina, USA.
Name Origin:
Named after its location.
Physical Properties:
Cleavage:
[???] Indistinct
Color:
brown red or black.
Density:
4.23
Diaphaniety:
Opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
7.5 - Garnet
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
brownish red
More details...