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Home > Images Dated > 2013 > May > 30 May 2013

Images Dated 30th May 2013

Choose from 3 pictures in our Images Dated 30th May 2013 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Cassiterite Partly Replacing Orthoclase, Wheal Coates, St Agnes, Cornwall, England Featured 30 May 2013 Image

Cassiterite Partly Replacing Orthoclase, Wheal Coates, St Agnes, Cornwall, England

Twinned crystals of orthoclase feldspar partially replaced by cassiterite. This rare kind of replacement, or partial pseudomorph, is best seen in specimens from Wheal Coates, which are now world famous. The crystals were locally called "stannite" which should not be confused with the tin, copper, iron sulphide of the same name. In Cornwall, cassiterite is concentrated in hydrothermal veins and pegmatites associated with granite intrusions. Cassiterite is the primary ore of tin, the most significant metal mined in Cornwall

© RIC, photographer A.G. Tindle