Bronzite is a member of the pyroxene group of minerals, belonging with enstatite and hypersthene to the orthorhombic series of the group. Rather than a distinct species, it is really a ferriferous variety of enstatite, which owing to partial alteration has acquired a bronze-like sub-metallic luster on the cleavage surfaces. The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. ... Minerals are natural compounds formed through geological processes. ... The pyroxene silicate minerals enstatite (MgSiO3) and ferrosilite (FeSiO3) form a complete solid solution series and are common rock-forming minerals found in igneous and metamorphic rocks and meteorites. ... Hypersthene is a common rock-forming mineral belonging to the group of orthorhombic pyroxenes. ... For the file system called Lustre, see Lustre (file system) Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock or mineral. ... Look up cleave or cleavage in Wiktionary, the free dictionary Cleavage has several common meanings, all related to the formation of a line between two parts: Cleavage - partial exposure of the separation between a womans breasts. ...

Enstatite is magnesium metasilicate, MgSiO₃, with the magnesia partly replaced by small amounts (up to about 5%) of ferrous oxide; in the bronzite variety, (Mg,Fe)SiOa, the ferrous oxide ranges from about 5 to 14%, and with still more iron there is a passage to hypersthene. The ferriferous varieties are liable to a particular kind of alteration, known as schillerization, which results in the separation of the iron as very fine films of oxide and hydroxides along the cleavage cracks of the mineral. The cleavage surfaces therefore exhibit a metallic sheen or schiller, which is even more pronounced in hypersthene than in bronzite. The color of bronzite is green or brown; its specific gravity is about 3.2 - 3.3, varying with the amount of iron present. Like enstatite, bronzite is a constituent of many basic igneous rocks, such as, norites, gabbros, and especially peridotites, and of the serpentines which have been derived from them. It also occurs in some crystalline schists. Magnesia (Greek: Μαγνησία Magnisia), deriving from the Macedonian tribe name Magnetes, is the name of the southeastern area of Thessaly in central Greece. ... An oxide is a chemical compound of oxygen with other chemical elements. ... Hydroxide is a polyatomic ion consisting of oxygen and hydrogen: −O−H It has a charge of −1. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Norite is a mafic intrusive igneous rock composed largely of the calcium rich plagioclase labradorite and hypersthene with olivine. ... Categories: Mineral stubs | Igneous rocks ... Peridotite Peridotite is a dense, coarse grained ultrabasic rock, consisting mainly of the minerals olivine and pyroxene. ... Serpentine Serpentine is a group of common rock-forming hydrous magnesium iron phyllosilicate ((Mg,Fe)3Si2O5(OH)4) minerals. ... Categories: Mineral stubs | Metamorphic rocks ...

Bronzite is sometimes cut and polished, usually in convex forms, for small ornamental objects, but its use for this purpose is less extensive than that of hypersthene. It often has a more-or-less distinct fibrous structure, and when this is pronounced the sheen has a certain resemblance to that of cats-eye. Masses sufficiently large for cutting are found in the norite of the Kupferbergin the Fichtelgebirge, and in the serpentine of Kraubat near Leoben in Styria. In this connection mention may be made of an altered form of enstatite or bronzite known as bastite or schiller spar. Here, in addition to schillerization, the original enstatite has been altered by hydration and the product has the approximate composition of serpentine. In color bastite is brown or green with the same metallic sheen as bronaite. The typical locality is Baste in the Radauthal, Harz, where patches of pale greyish-green bastite are embedded in a darker-colored serpentine. This rock when cut and polished makes an effective decorative stone, although little used for that purpose. Styria (Steiermark in German, Štajerska in Slovenian) can refer to: Styria - a federal state of Austria Styria - an informal province in Slovenia Styria - a duchy of the Holy Roman Empire and crownland of Austria-Hungary This is a disambiguation page — a navigational aid which lists other pages that might otherwise...

This article incorporates text from the public domain 1911 Encyclopædia Britannica. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... The Eleventh Edition of the Encyclopædia Britannica (1911) in many ways represents the sum of knowledge at the beginning of the 20th century. ...