• WordNet 3.6
    • n hornblende a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron
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Webster's Revised Unabridged Dictionary
    • n Hornblende (Min) The common black, or dark green or brown, variety of amphibole. (See Amphibole.) It belongs to the aluminous division of the species, and is also characterized by its containing considerable iron. Also used as a general term to include the whole species.
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Century Dictionary and Cyclopedia
    • n hornblende A common mineral, crystallizing in the monoclinic system with a prismatic angle of 124½°. Parallel to this, the fundamental prism, it has perfect cleavage. It occurs usually in massive forms, varying in structure from compact to columnar and fibrous, with the fibers parallel or curved, and also, but less often, lamellar. In composition it varies widely, from the white tremolite, a silicate of calcium and magnesium, to the green actinolite, which contains also more or less iron, and to the dark-green, brown, and black varieties, pargasite and common hornblende, which contain alumina as well as lime, magnesia, and iron; manganese is also present in some varieties, and less commonly sodium and potassium. Asbestos, mountain-cork, and mountain-leather are included here, and nephrite or jade is a tough, compact variety. Hornblende is a constituent of many crystalline rocks. as syenite, diorite, hornblende schist, some kinds of trachyte, andesite, etc. The name amphibole is often used as the general term to include all the varieties. The hornblende or amphibole group of minerals includes also the related orthorhombic species anthophyllite, and the monoclinic arfvedsonite, crocidolite. glaucophane, etc. In geology, hornblende or hornblendic is often prefixed to names of rocks to indicate the accidental presence in greater or less quantity of that mineral, in addition to the other ingredients which the rock usually contains. Hornblende is a frequent result of the metamorphism of other minerals, especially of augite.
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Chambers's Twentieth Century Dictionary
    • n Hornblende horn′blend a mineral of various colours, found in granite and other igneous rocks that contain quartz.
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Webster's Revised Unabridged Dictionary
G., fr. horn, horn + blende, blende
Chambers's Twentieth Century Dictionary
Ger. horn, horn, and -blendeblenden, to dazzle.


In literature:

I heard one fellow say once that they thought they'd never find gold in hornblende.
"The Killer" by Stewart Edward White
We still ascend in altitude as we go westwards, and come upon long tracts of gneiss with hornblende.
"The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume I (of 2), 1866-1868" by David Livingstone
To-day the granite became stratified, or gneiss; there were also some fine specimens of hornblend.
"Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 1" by James Richardson
Of hornblende schist; these are elongate and intended to be used with both hands.
"Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico in 1880" by James Stevenson
Hornblende schists and beds of metamorphic limestone are rare.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
The floor is formed of the native rock (hornblende), and is very uneven.
"Notes and Queries, Number 203, September 17, 1853" by Various
Often they are comparatively rich in brown hornblende.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
A variety of trap, composed of hornblende and felspar.
"Principles of Geology" by Charles Lyell
ACTIN'OLITE, a mineral nearly allied to hornblende.
"The New Gresham Encyclopedia. Vol. 1 Part 1" by Various
These are, felspar, quartz, mica, hornblende, and carbonate of lime.
"A Manual of Elementary Geology" by Charles Lyell