- a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate.
Origin of hornblende
Examples from the Web for hornblende
Historical Examples of 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
Hornblende, like augite, also includes a great many minerals.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
Word Origin 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]
- 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.