Tetragonal Collection

Discover the geological wonders of Cornwall, England, where tetragonal minerals abound

Tetragonal Collection: Torbernite on Quartz, Wheal Basset, Illogan, Cornwall, England

Torbernite on Quartz, Wheal Basset, Illogan, Cornwall, England
An earthy, orange coated, quartz mass bearing fine towers and clusters of books of emerald to bottle green square plates of torbernite

Tetragonal Collection: Chalcocite with Chalcopyrite, Tincroft Mine, Illogan, Cornwall, England

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

Tetragonal Collection: Chalcopyrite on Quartz, Dolcoath Mine, Camborne, Cornwall, England

Chalcopyrite on Quartz, Dolcoath Mine, Camborne, Cornwall, England
Brassy yellow crystals of chalcopyrite, with an iridescent tarnish, on colourless quartz crystals. The specimen label states Six sided cristals of yellow copper ore crossing each other in opake

Tetragonal Collection: Brookite C016 / 5623

Brookite C016 / 5623
Brookite. Specimen of the mineral brookite (titanium oxide) from Tremadoc wales. Brookite is a polymorph, it has the same chemical composition as rutile and anatase. Natural History Museum, London, UK

Anatase
A brown to black single tetragonal crystal of anatase (titanium oxide). Anatase is a polymorph of rutile and brookite, meaning they carry the same chemistry, but with a different structure

Brookite
A specimen of the mineral brookite (titanium oxide) from Tremadoc wales. Brookite is a polymorph, it has the same chemical composition as rutile and anatase

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Discover the geological wonders of Cornwall, England, where tetragonal minerals abound. 🔵 Torbernite on Quartz, a phosphate mineral, glimmers at Wheal Basset and Illogan mines. 🌉 Chalcocite and Chalcopyrite, copper minerals, are found together at Tincroft Mine in Illogan. 🔵 Copper-bearing Chalcopyrite on Quartz is a common sight at Dolcoath Mine in Camborne. 🔵 Rare minerals like Brookite C016 / 5623 and Anatase add to the region's geological diversity. 🔵 Rutile and Brookite, both titanium oxides, complete the tetragonal lineup in Cornwall's rich mining history. 🌎 #CornwallMines #TetragonalMinerals #Geology #MiningHistory