horn-blende

hornblende

[hawrn-blend]
noun
a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate.

Origin:
1760–70; < German; see horn, blende

hornblendic, adjective
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World English Dictionary
hornblende (ˈhɔːnˌblɛnd)
 
n
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)5Si6(Si,Al)2O22(OH)2
 
[C18: from German Horn horn + blende]
 
horn'blendic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hornblende   (hôrn'blěnd')  Pronunciation Key 
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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