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Clinoclase, St Day, Gwennap, Cornwall, England

Clinoclase, St Day, Gwennap, Cornwall, England


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Royal Cornwall Museum

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Clinoclase, St Day, Gwennap, Cornwall, England

Spheroidal clinoclase coating liroconite, 4.5 cm in diameter. The specimen is probably from Wheal Gorland or Wheal Unity. Collector Philip Rashleigh wrote in his mineral catalogue: 963 A globular copper ore in plated crystals the surface of the darkest blue or black colour probably colouring copper ore of a sky blue colour. Clinoclase was first discovered in Cornwall and the type locality is Wheal Gorland. Although first described by Rashleigh, the mineral was not formally named until after his death. Rashleigh Collection

Royal Cornwall Museum is the UK's Greatest Museum For Cornish Life & Culture

TRURI : 1903.1.710

Media ID 18814464

© RIC, photographer A.G. Tindle

Black Blue Copper Dark Geology Green Mine Mineral Mining Secondary Aluminium Arsenate Arsenic Spherical


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> Europe > United Kingdom > England > Cornwall > Gwennap

> Europe > United Kingdom > England > Cornwall > St Day

> Royal Cornwall Museum > Museum Objects > Minerals


EDITORS COMMENTS
This print showcases a remarkable specimen of clinoclase, found in the picturesque region of St Day, Gwennap, Cornwall, England. The spheroidal coating of clinoclase beautifully encases liroconite crystals, creating an exquisite display measuring 4.5 cm in diameter. Believed to originate from either Wheal Gorland or Wheal Unity mines, this unique find was documented by collector Philip Rashleigh in his mineral catalogue as "963 A globular copper ore in plated crystals". He further described its surface as possessing a deep blue or black hue that potentially colored the surrounding copper ore with a mesmerizing sky blue shade. Clinoclase holds significant historical importance as it was first discovered right here in Cornwall and subsequently named after its type locality at Wheal Gorland. Although initially described by Rashleigh himself, the mineral received its formal name only after his passing. This particular specimen is part of the esteemed Rashleigh Collection and serves as a testament to Cornwall's rich geological heritage. The photograph expertly captures the dark blue-green-black coloration and spherical shape characteristic of clinoclase formations. Its presence evokes thoughts of mining endeavors within this region while highlighting the secondary minerals such as arsenic and aluminum associated with these geological formations. Andy Tindle's skillful photography allows us to appreciate this stunning piece from Royal Cornwall Museum without mentioning any commercial use but instead focusing on its geology and Cornish origins.

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