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augite

Definitions

  • WordNet 3.6
    • n augite dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium
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Webster's Revised Unabridged Dictionary
    • n Augite A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene.
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Century Dictionary and Cyclopedia
    • n augite The dark-green to black variety of pyroxene characteristic of basic eruptive rocks like basalt. It differs from other varieties of pyroxene in containing a considerable proportion of alumina. The name is sometimes used to include the whole species. See pyroxene.
    • n augite The name of this member of the pyroxene group of silicate minerals is frequently used in petrography in composition with the name of any rock in which it occurs as a prominent or noteworthy constituent: as, augite-andesite, augite-syenite, augite-gneiss, etc.
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Chambers's Twentieth Century Dictionary
    • n Augite aw′jīt one of the Pyroxene group of minerals, closely allied to hornblende, usually of a greenish colour, occurring crystallised in prisms, and forming an essential component of many igneous rocks
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Etymology

Webster's Revised Unabridged Dictionary
L. augites, Gr. a'ygi`ths, fr. a'ygh` brightness: cf. F. augite,
Chambers's Twentieth Century Dictionary
Gr. augē, brightness.

Usage

In literature:

Below this were strata of trachitic breccia and augite; the formation was then seamy to an unknown depth.
"Scientific American Supplement, No. 392, July 7, 1883" by Various
We knew that the place was ugly and sinister, but feldspar and augite didn't give it that look.
"The White Waterfall" by James Francis Dwyer
With the exception of quartz and augite, these names are, however, representatives of different classes of minerals.
"Elements of Agricultural Chemistry" by Thomas Anderson
The augite is usually violet coloured, and shows zonal and hour-glass structures.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3" by Various
Melaphyre is a name given to the very dark varieties of altered augitic lavas, rich in magnetite and chlorite.
"Volcanoes: Past and Present" by Edward Hull
Chlorite arises from biotite, augite and hornblende.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4" by Various
The lava is of an augitic character, and magnetic; it possesses a specific gravity of 2.3636 at 25 deg.
"Etna" by G. F. Rodwell
These are distinguished from augite by containing little or no aluminium.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
Many dolerites are porphyritic and carry phenocrysts of olivine, augite and plagioclase felspar (or of one or more of these).
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
It has, generally, a flesh-red colour, and contains some specks of augite, but little or no mica.
"Narrative of a Second Expedition to the Shores of the Polar Sea" by John Franklin
The dark matrix consists of biotite, aegirine-augite and melanite.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3" by Various
PYROXENIC-PORPHYRY, same as augitic-porphyry, pyroxene being Hauey's name for augite.
"A Manual of Elementary Geology" by Charles Lyell
The augite is mostly a variety of diopside and is only occasionally idiomorphic.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10" by Various
There are a number of varieties or sub-species of augite.
"Geology" by James Geikie
Columns, pentagonal or heptagonal, crown the tops of hills, and seem rather a composition of hornblende than of augite and feldspar.
"The Highlands of Ethiopia" by William Cornwallis Harris
DI'ALLAGE, an altered form of the mineral augite, with a lamellar structure, and a submetallic lustre on its planes of separation.
"The New Gresham Encyclopedia" by Various
The hornblende of granites is usually pale green in section, the augite and enstatite nearly colourless.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
Among other minerals found in them are biotite and chlorite, tourmaline, epidote, apatite, garnet, hornblende and augite, sphene, pyrites.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5" by Various
The biotite is brown; the hornblende brown or greenish brown; the augite usually green.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various
They consist essentially of olivine and augite with a brownish glassy ground mass.
"Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6" by Various
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