General Information:
Chemical Formula:
(Zn,Fe++)(2-2x)(Ti)xAl4O8
Composition:
(Molecular Weight = 335.37 gm)
Titanium 3.43 % Ti
Aluminum 32.18 % Al
Zinc 15.40 % Zn
Iron 10.82 % Fe
Oxygen 38.17 % O
Empirical Formula:
Zn0.79Fe0+0.65Ti0.24Al4O8
Environment:
Formed by breakdown of gahnite in diasporites (diaspore-bearting metabauxites) and emeries (corundum-bearing metabauxites).
IMA Status:
Approved IMA 1994 (Dana # Added)
Locality:
TL: Emory deposit at Kerketefs Mountain, Samos Island, Greece.
Name Origin:
Named as the dominant analogue of hgbomite, found as the 8H and 16H polytypes.
Physical Properties:
Cleavage:
None
Color:
deep brown or black.
Density:
4.36
Diaphaniety:
Transparent to Opaque
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Pseudo Tetragonal - Crystals show a tetragonal shape.,
Hardness:
7 - Quartz
Luster:
Adamantine
Streak:
brownish
More details...