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Augite is a common rock-forming mineral in igneous and metamorphic rocks, with variable color and composition. Learn about its chemical formula, crystal forms, varieties, localities, uses, and how to distinguish it from similar minerals.
Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na) (Mg,Fe,Al,Ti) (Si,Al)2O6. The crystals are monoclinic and prismatic. Augite has two prominent cleavages, meeting at angles near 90 degrees. Characteristics. Euhedral crystal of augite from Teide (4.4 x 3.0 x 2.3 cm)
- Commonly as stubby prismatic crystals, also acicular, skeletal, dendritic
- Prismatic (2/m), (same H-M symbol)
- 5.5 to 6
- Monoclinic
Augite is a dark-colored silicate mineral that belongs to the clinopyroxene group of pyroxenes. It is found in mafic and intermediate igneous rocks such as basalt, gabbro, andesite, and diorite, as well as in some metamorphic rocks and meteorites.
Mar 15, 2019 · The most common pyroxene, augite is named after the Greek word augites, which means “brightness”—a reference to its occasional shiny appearance. Most augite has a dull, dark green, brown, or black finish. Augite occurs chiefly as short, thick, prismatic crystals with a square or octagonal cross section and sometimes as large, cleavable ...
Augite, the most common pyroxene mineral (a silicate of calcium, magnesium, iron, titanium, and aluminum). It occurs chiefly as thick, tabular crystals in basalts, gabbros, andesites, and various other dark-coloured igneous rocks. It also is a common constituent of lunar basalts and meteorites rich.
- The Editors of Encyclopaedia Britannica
5½ - 6. Specific Gravity: 3.19 - 3.56. Crystal System: Monoclinic. Member of: Clinopyroxene Subgroup > Pyroxene Group. Name: Named by Abraham G. Werner in 1792 from the Greek αυγή ("auge") for "shine" or "luster," in allusion to the appearance of its cleavage surfaces. Pyroxene Group, Clinopyroxene Subgroup.
Pyroxene is a group of related minerals that share a similar crystal structure and occur in igneous and metamorphic rocks. Augite is a dark green to black iron- and calcium-rich pyroxene that is common in mafic and ultramafic igneous rocks.
