- a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate.
Origin of hornblende
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Examples from the Web for hornblende
The minerals at contact are quartz, biotite, magnetite and hornblende.The Long Labrador Trail
The magnetic iron ore is associated with hornblende and quartzite.A Report on Washington Territory
William Henry Ruffner
Brown hornblende, like that of the camptonites, occurs in many of them.
White crystals of felspar in a dark base of hornblende and felspar.A Manual of Elementary Geology
Diorite is a crystalline aggregate of a soda-felspar and hornblende.Geology
- a black or greenish-black mineral of the amphibole group, found in igneous and metamorphic rocks. Composition: calcium magnesium iron sodium aluminium aluminosilicate. General formula: (Ca,Na) 2.3 (Mg,Fe,Al) 5 Si 6 (Si,Al) 2 O 22 (OH) 2
C18: from German Horn horn + blende
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
Word Origin and History for hornblende
The term "Hornblende" is an old German name for any dark, prismatic crystal found with metallic ores but containing no valuable metal (the word "Blende" indicates "a deceiver") [Herbert Bucksch, "Dictionary Geotechnical Engineering," 1995]
Online Etymology Dictionary, © 2010 Douglas Harper
- A common, green to black mineral of the amphibole group. It has a variable composition and occurs in monoclinic crystals with a hexagonal cross-section, in fibrous forms, or in granular forms. Hornblende is found in many metamorphic and igneous rocks. Chemical formula: (Ca,Na)2-3(Mg,Fe,Al)5(Al,Si)8O22(OH)22.
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