| Gemological
Information |
| Color
: |
Brownish-red
to black. |
| Refractive
Index: |
2.62-2.90.
Metallic to adamantine luster |
| Chemical
Composition: |
Titanium
oxide. |
| Hardness: |
6-6.5 |
| Crystal
Group: |
Tetragonal. |
| Ocurrence: |
Brazil,
George, Arkansas, North Carolina,
other locations. Usually found as
needle-like crystal inclusions in
quartz (rutilated quartz) or agate
(sagenite) and in many other materials.
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