s
Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

CHALCOPYRITE


CHALCOPYRITE (Chalcopyrit—Chalcopyrite— ’алькопирит) (Henckel, J.F. 1725), from Gk. “chalkos” – copper and pyrite, because of its copper content and similar appearance to that mineral. Dioscorides (50) observed that this is a good, distinctive name for the ore. Sulfide – CuFeS2, tetragonal system. Hardness 3.5-4. Density 4.1-4.3. Metal luster. Fragile. Chalcopyrite is a widespread mineral, which is found in the shape of isometric, sometimes, pseudocubic crystals and grained masses. Non-transparent, of brass-yellow color, often with greenish tint and polychromatic blueing on the surface. The size of its crystals is not more than 10 cm. in cross-section. It forms pseudomorphs on pyrite and magnetite, it is found as ornamental inclusions in chrysolite and rock crystal. Chalcopyrite looks like pyrite, native gold and pentlandite. In jewelry they use chalcopyrite in crystals or massive motley copper ore with bright blueing for cut in cabochons. Chalcopyrite is formed at deposits of magmatic, contact-metasomatic, hydrothermal and sedimentary genesis in the shape of crystals and grained aggregates. In Russia, in the Subpolar Urals Mts., chalcopyrite in well-formed crystals up to 10 cm. is found at the deposits of rock crystal Puiva and Pelingichey-III. In the Middle Urals, findings of such crystals are not rare at the Berezovskiy mine and others. In the Primorskiy Region, crystals of chalcopyrite up to 12 cm. at the Dal’negorskoye deposit, they found. In Central Kazakhstan, crystals of chalcopyrite up to 10 cm. occur at the deposits Quara Oba and Zhezkazgan. In Japan, at the Arakawa deposit, Akita Pref., crystals of chalcopyrite reached 6 cm. It is found at many ore deposits of the world. The greatest size up to 15 cm. crystals chalcopyrite occur in France at deposits La Gardette, Dauphin, Alpes-de-Haute-Prov.; in Great Britain —at Saint Agnes; in Bulgaria – at Medet and Aserel deposit; also in Spain – in the Rio Tinto Dist.

Synonyms. Yellow copper | Cupropyrite | Apache’s gold | Yellow copper ore | Yellow iron ore | Yellow ore | Copper pyrites | Yellow copper pyrites | Towanite, after the Towanna deposit on the Cornwall Penin., Great Britain.

Search