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

BORNITE


BORNITE (Bornit—Bornite—Ѕорнит) (Werner, A.G. 1791), after I.E. von Born (1742-1791), an Austrian mineralogist, paleontologist and metallurgist. Sulfide – Cu5FeS4, orthorhombic system. Hardness 3. Density 5. Metal luster. Fragile. Bornite is found at ore deposits of different genesis, where it is represented mainly with solid grained masses, crystals of it are very rare. Non-transparent. Color: copper-red with red-violet or blue blueing, because of which it is called peacock ore. It forms pseudomorphs on crystals chalcopyrite. In rocks it is observed in the shape of ornamental insets and alas well as cement in sandstones. In Russia, bornite was found in significant volumes in ores of the Volkovskoye deposit in the Middle Urals. In Kazakhstan, at the Zhezkazgan deposit, they described its crystals up to 5 cm. At deposits of Austria – Hohen Tauern, near Salzburg, and Frossnizalpie in East Tyrol – crystals of bornite up to 8 cm. are not rare. Similar crystals are found in Italy, at the Mertbal Arntale deposit, South Tyrol Prov. In Czech Rep., at the Vranςice deposit, by Príbram. In Zimbabwe, at the Mhangura (Mangula) deposit, crystals of bornite reach 7 cm.; in Congo (Kinshasa), at the Likasi deposit, Katanga Prov. – to 5 cm. At deposits of Peru and Chile, bornite comes in to the composition of local motley copper ore, which is used in manufacturing of cabochons because of its bright blueing. In the U.S.A., bornite is known under the trade name peacock ore; it was extracted at deposits of Arizona – Bisbee, Montana —Butte, also California, Virginia, South Carolina and Alaska.

Synonyms. Buntcukupferkies, Germ. | Purple copper | Chalcedonian emerald, Pliny the Elder | Erubescite, from Lat. “erubesco” – to turn red, after its color | Violet copper glass | ~ copper ore: blue ~, brown ~, motley ~, purple ~, violet ~ | Phillipsite (phillipsine) after the Engl. mineralogist W. Phillips. | Poikilit | Poikilopyrites | Copper purpur | Motley copper pyrites | Peacock stone.

Search