Lustrous, deep blue crystals of spinel etched out of the encasing
calcite.
Origin: Beronono, Toliara, Madagascar, Africa
Sample size: 2.1 x 1.8 x 1.5 cm (top/2nd row), 5.4 x 3.5 x 2.9 cm (3rd/4th
row), 3.2 x 2.4 x 1.7 cm (5th row), 3.4 x 2.5 x 1.7 cm (6th row), 5.3 x 4.2 x
3.7 cm (bottom)
Spinel with spinel law twin
This specimen has two spinel law twins that are intergrown.
This specimen has two spinel crystals to 1.2 cm across and a few scattered
crystals of pale green
diopside.
Origin: Morogoro, Tanzania, Africa
Sample size: 2.3 x 2.2 x 1.8 cm (top), 2.5 x 2.5 x 2.1 cm (2nd row), 1.5 x 1.3
x 1.2 cm (3rd row), 6 x 5.5 x 4 cm (bottom)
Origin: Mogok, Burma
Ex. Isaias Casanova collection
Sample size: 0.9 x 0.9 x 0.8 cm
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