Cassiterite. Botallack Mine, Cornwall, Britain




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110µm


Radiating botryoidal cassiterite, known as wood-tin (light grey-brown), is intergrown with quartz (dark grey, top right). Variations in colour of the cassiterite are related to grain size and abundance of fine-grained silica inclusions.


Polished block, plane polarized light, x 180, air



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