augite

au·gite

A0519900 (ô′jīt′)n. A dark-green to black pyroxene mineral, (Ca,Na)(Mg,Fe,Al)(Si,Al)₂O₆, that contains large amounts of aluminum, iron, and magnesium.

[Latin augītis, a precious stone, from Greek augītēs, from augē, brightness.]

augite

(ˈɔːɡaɪt) n (Minerals) a black or greenish-black mineral of the pyroxene group, found in igneous rocks. Composition: calcium magnesium iron aluminium silicate. General formula: (Ca,Mg,Fe,Al)(Si,Al)2O6. Crystal structure: monoclinic[C19: from Latin augītēs, from Greek, from augē brightness] augitic adj

au•gite

(ˈɔ dʒaɪt)

n. a silicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark green to black variety of monoclinic pyroxene, characteristic of basic rocks. [1780–90; < Latin augītis a kind of precious stone] au•git•ic (ɔˈdʒɪt ɪk) adj.

Thesaurus

Noun

augite - dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesiummineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

Augite

augite

[′ȯ‚jīt] (mineralogy) (Ca,Mg,Fe)(Mg,Fe,Al)(Al,Si)₂O₆ A general name for the monoclinic pyroxenes; occurs as dark green to black, short, stubby, prismatic crystals, often of octagonal outline.

Augite

a mineral of the pyroxene group.

In chemical composition and crystalline structure, augite belongs to the chain silicates. Its approximate chemical formula is (Ca, Na) (Mg, Fe”, Fe”’, Al, TI) [(Si, A1)₂O₆]. It forms short prismatic or flattened isometric crystals of the monoclinic system with good prismatic cleavage along two surfaces that intersect at an angle of 87–88°. Its density is between 3,200 and 3,600 kg/m³. Its hardness is five or six on the ten-degree scale. Augite is greenish black, with a glassy luster. The mineral develops by crystallization from magmatic melts as a rock-forming mineral in many igneous rocks. It is converted to hornblende (uralite) or chlorite when altered by the action of hydrothermal solutions, and to the free oxide Si0₂ (opal), iron hydroxide, carbonates, and argillaceous halloysite and nontronitic products by weathering.

augite

au·gite

augite

au•gite

Augite

augite

Augite

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Words related to augite

noun dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium

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