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augite

American  
[aw-jahyt] / ˈɔ dʒaɪt /

noun

  1. a silicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks.


augite British  
/ ˈɔːɡaɪt /

noun

  1. 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) 2 O 6 . Crystal structure: monoclinic

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

augite Scientific  
/ ôjīt′ /
  1. A glassy, dark-green to black variety of pyroxene. Chemical formula: (Ca,Na)(Mg,Fe,Al)(Si,Al) 2 O 6 .


Other Word Forms

Etymology

Origin of augite

1780–90; < Latin augītis a kind of precious stone < Greek, equivalent to aug ( ) sunlight + -ītis, feminine of -ītēs -ite 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Like obsidian, in fact, their edges are sharp but the shards have an almost twirly shape and lack the crystalline structure of black-colored minerals like augite or tourmaline.

From Salon Mar. 4, 2025

Uralitisā′tion, the paramorphic change of augite to hornblende.—v.t.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

It is a dark green or black stone, composed of augite and felspar, very compact in texture, and of considerable hardness, often found in regular pillars of three or more sides called basaltic columns.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Sir Charles Lyell

Diallage, dī′al-āj, n. a mineral nearly allied to augite, brown, gray, or green in colour, laminated in structure, with a metallic lustre when broken across.—adjs.

From Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) by Various

Green augite and hypersthene form a considerable part of these rocks, they may contain also biotite, hornblende and quartz.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" by Various

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