Purple to green zoned fluorite in 18 mm interpenetrant twin, Blue Circle Quarry, Eastgate, Weardale, Co Durham. photo

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09-MAR-2013

Purple to green zoned fluorite in 18 mm interpenetrant twin, Blue Circle Quarry, Eastgate, Weardale, Co Durham.

Published (Figure 8) in The Mineralogical Record, volume 52, March-April 2021. Smith & Holtkamp, Twinning in Fluorite Crystals.

Sony Alpha 77
1/4s f/18.0 at 105.0mm iso200 full exif

other sizes: small medium large original auto

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