Mineral: | Dumortierite
| Chemical Formula: | Al6.5-7(BO3)(SiO4)3(O,OH)3 | Size: | | Weight: | | Transparence: | | Quantity: | | Origin: | Ohngaing (Ohn Gaing; Ohn Kai) village, near Mogok, Burma (Myanmar) | Here you a really rare occurring Dumortierite crystal with gemmy transparency, the crystal shows three crystal faces, partly with striation and luster. This species is rarely occurring is facet grade quality, the hardness is like chrysoberyl. The color is ranging from light to reddish brown hues depending on the orientation (pleochroism). A rare gemmy reference specimen from Burma !!
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