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Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

 
Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

Photo below under shortwave ultraviolet illumination:
Fluorite (interpenetrant-twins) on Quartz from Blackdene Mine, Ireshopeburn, Weardale, County Durham, England

DESCRIPTION:No. 73394
Mineral:Fluorite (interpenetrant-twins) on Quartz
Locality:Blackdene Mine, Ireshopeburn, Weardale, County Durham, England
Description:Lustrous transparent purple-gray cubic fluorite crystals to 9 mm on milky quartz crystals to 13 mm over brown limonite-siderite. The fluorite crystals exhibit interpenetrant twinning and fluoresce violet under SW UV illumination. Ex. James Dobo, jr. collection; collected ca. 1980
Overall Size:8x6.5x3.5 cm
Crystals:micro to 9 mm
Status: Sold - Posted here for reference only
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