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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.
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Augite is a common rock-forming mineral that belongs to the pyroxene group, which also includes diopside and hedenbergite. It has a wide range of colors, crystal forms, and chemical formulas, and it often alters to other minerals such as hornblende and actinolite.
- Formation
- Chemistry
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Augite is a rock-forming mineral that commonly occurs in mafic and intermediate igneous rocks such as basalt, gabbro, andesite, and diorite. It is found in these rocks throughout the world, wherever they occur. Augite is also found in ultramafic rocks and in some metamorphic rocks that form under high temperatures.
Augite has a chemical composition of (Ca,Na)(Mg,Fe,Al)(Si,Al)2O6 with many paths of solid solution. Commonly associated minerals include orthoclase, plagioclase, olivine, and hornblende.
Augite is the most common pyroxene mineral and a member of the clinopyroxene group. Some people use the names \"augite\" and \"pyroxene\" interchangeably, but this usage is strongly discouraged. There are a large number of pyroxene minerals, many of which are distinctly different and easy to identify. Augite, diopside, jadeite, spodumene, and hyper...
Augite is usually green, black, or brown in color with a translucent to opaque diaphaneity. It usually exhibits two distinct cleavage directions that intersect at slightly less than 90 degrees. A hand lens is often needed to properly observe the cleavage, especially in fine-grained rocks.
Light reflecting from cleavage surfaces and crystal faces of augite produces a vitreous luster, while light striking other surfaces produces a dull luster. Augite has a Mohs hardness of 5.5 to 6. Its specific gravity of 3.2 to 3.6 is higher than most other minerals in the rocks in which it occurs. Augite does not have any physical, optical, or chem...
Augite is a mineral that has been found beyond Earth. It is a common mineral of lunar basalts. It has also been identified in many stone meteorites. Some of these meteorites are thought to be pieces of Mars or the Moon that were launched into space by large impact events.
Augite is a dark-colored silicate mineral that occurs in mafic and intermediate igneous rocks such as basalt and gabbro. It is the most common pyroxene mineral and has no commercial use, but it is found in lunar basalts and some meteorites.
- A single chain inosilicate
- Dark green, black, brown
Lustre: Vitreous. Hardness: 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.
Mar 15, 2019 · Augite occurs chiefly as short, thick, prismatic crystals with a square or octagonal cross section and sometimes as large, cleavable masses. It occurs in a solid-solution series in which diopside and hedenbergite are the end-members.
- Distinct/Good Good on {110}
- Greenish gray, light to dark brown
- Vitreous
Augite is a rock-forming mineral of the pyroxene group commonly found within igneous and metamorphic rocks. Because its chemical structure is highly variable, augite might be considered by some to be its own group of minerals rather than an individual mineral.
Augite Mineral Data. General Augite Information. Chemical Formula: (Ca,Na) (Mg,Fe,Al,Ti) (Si,Al)2O6. Composition: Molecular Weight = 236.35 gm. Sodium 0.97 % Na 1.31 % Na 2 O. Calcium 15.26 % Ca 21.35 % CaO. Magnesium 9.26 % Mg 15.35 % MgO. Titanium 2.03 % Ti 3.38 % TiO 2. Aluminum 4.57 % Al 8.63 % Al 2 O 3. Iron 4.73 % Fe 6.08 % FeO.
