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Measurements: 41 x 19 x 18 mm Description: A window quartz crystal with faint smoky colouring. It has two windows, one of which has a lovely 'stepped' pattern. Both have bits of clay trapped inside. The specimen has a flaw and a few nicks. Weight of Specimen: 16 g Chemical Composition: SiO2 Hardness on Mohs Scale: 7 Location: Brandberg, Namibia. Specimen Code: NBB 132 US $ 18 .. . . .
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