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Caption: Barytes from the Alva Silver Mine, Silver Glen, east of Alva.
Description: Barytes is composed of barium sulphate. It is a mineral of the orthorhombic crystal system and has a high specific gravity. British Geological Survey Petrology Collection sample number MC 7353. This specimen is from the Alva Silver Mine which is situated one-quarter of a mile up the Silver Glen and half a mile east of Alva. The vein was discovered in 1711 by Sir John Erskine who brought miners from Leadhills to work it. The silver ore was found in thin strings at the surface. The barytes occurred in the veins as a gangue mineral along with calcite and quartz.
Date taken: Sun Jun 25 00:00:00 GMT 1905
Photographer: Unknown
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