1732 Cassiterite, Topaz, Royal George Mine, Avoca-Royal George mining district, Northern Midlands municipality, Tasmania December 30, 2021 Steve Australasia Australia Tasmania Dark brown cassiterite crystals and an iron-stained topaz crystal (centre top) embedded in a corroded greisen matrix. Width of view 9.5mm. Stack of 40 images. Click on the image below for a higher resolution version.
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