Rights Managed > Royal Cornwall Museum > Museum Objects > Minerals
Chalcocite with Chalcopyrite, Tincroft Mine, Illogan, Cornwall, England
Filename: TRURI-1903-1-826.jpg
Size: 4712 x 3534 (2.4MB)
Date: 15th October 2013
Source: Royal Cornwall Museum
Author: Andy Tindle
© RIC, photographer A.G. Tindle
Wall Art and Photo Gifts from Royal Cornwall Museum
Chalcocite with Chalcopyrite, Tincroft Mine, Illogan, Cornwall, England
Steel coloured crystals of chalcocite covering chalcopyrite. This botryoidal variety of chalcopyrite is known as blister copper. The specimen was drawn for Specimens of British Minerals, Selected from the Cabinet of Philip Rashleigh (1797, Volume 1, Plate 9, Figure 4) which states Is yellow mammillary copper ore, covered with a thin coat of a bluish-green colour, with crystals of steel-coloured copper ore, composed of prisms having six sides, and truncated ends, formed upon the mammillary copper ore. d One of the steel-coloured crystals magnified. From Tincroft. Chalcocite is a secondary mineral occurring in or near the oxidised zone of copper sulfide deposits. Rashleigh Collection
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TRURI : 1903.1.826
Media ID 19171541
© RIC, photographer A.G. Tindle
Black Blue Copper Geology Gray Grey Iron Metal Metallic Mine Mineral Mining Secondary Specimen Sulfide Sulphide Yellow Brea Carn Monoclinic Tetragonal Variety
EDITORS COMMENTS
This print showcases a remarkable specimen of Chalcocite with Chalcopyrite, discovered in the historic Tincroft Mine located in Illogan, Cornwall, England. The steel-colored crystals of chalcocite elegantly envelop the chalcopyrite mineral, forming a mesmerizing display. This particular variety of chalcopyrite is known as blister copper due to its botryoidal formation. The image originates from Philip Rashleigh's renowned publication "Specimens of British Minerals" published in 1797. Plate 9, Figure 4 depicts this extraordinary find and provides an insightful description: "Is yellow mammillary copper ore, covered with a thin coat of bluish-green color, with crystals of steel-colored copper ore composed of prisms having six sides and truncated ends". One can observe a magnified view capturing one of these fascinating steel-colored crystals. Chalcocite is classified as a secondary mineral that typically occurs within or near the oxidized zone of copper sulfide deposits. This exceptional specimen belongs to the esteemed Rashleigh Collection at Royal Cornwall Museum - an invaluable treasure for geology enthusiasts. Its composition includes elements such as copper (Cu), iron (Fe), and sulfur (S). The photograph beautifully captures the metallic luster and intricate structure exhibited by this unique geological marvel found deep within Tincroft mine
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