Large Spinel Crystal / cluster, Unknown Origin ex. Roy Foerster Collection 6.5 cm x 6.0 cm x 4.2 cm, 191.6 grams   Here is a pretty amazing large spinel from an old collection. This is a Spinel cluster is made up of one very large crystal crystal along with some smaller inter-grown ones. On the back side, it looks like the large crystal melted away and only hundreds of t… More info

Spinel on Calcite (#1) Mahenge, Morogoro Region, Tanzania 1.83 cm x 1.58 cm x 1.3 cm   Here is a wonderful small specimen of Spinel crystals on Calcite from Tanzania. Many call these *Ruby Spinel* not only due to the coloring,  but also due to the very high chromium content, which turns it the brightest red color under UV lighting. This specimen looks a lit… More info

Spinel on Calcite Mahenge, Morogoro Region, Tanzania 2.2 cm x 1.9 cm x 1.8 cm   Here is a wonderful small specimen of Spinel crystals on Calcite from Tanzania. Many call these *Ruby Spinel* not only due to the coloring,  but also due to the very high chromium content, which turns it the brightest red color under UV lighting. This specimen looks a little mor… More info

Large Spinel Crystal, Twinned, Unknown Origin ex. Roy Foerster Collection 4.25 cm x 4.45 cm x 3.19 cm, 71.1 grams   This is a one very nice, large spinel crystal. The twinning of this crystal is pretty amazing. The surface has some wild growth and etching, included a pretty interesting feature that appears to be a negative face. The color is hard to determine to the eye.… More info