| jdl BROOKITE, Magnet Cove, Arkansas, 7.5 x 4 x 2.5 cm | |
 | ex Dr A Lincoln Sherk collection, Black crystals of the titanium oxide Brookite. |
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| jdl BROOKITE, Magnet Cove, Arkansas, 7.5 x 4 x 2.5 cm | |
| ex Dr A Lincoln Sherk collection, Black crystals of the titanium oxide Brookite. |
|