Also found in: Thesaurus, Encyclopedia, Wikipedia.
The most common mineral in the amphibole group, CaNa(Mg,Fe)4(Al,Fe,Ti)3Si6O22(OH,F)2 commonly green to black, found in igneous and metamorphic rocks.
(Minerals) 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]
a dark green to black mineral of the amphibole group, containing calcium, magnesium, iron, and aluminosilicates.
A common, green to black mineral found in many metamorphic and igneous rocks. It is composed of iron, calcium, magnesium, and other metals.
A variety of amphibole.
Switch to new thesaurus
|Noun||1.||hornblende - a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron|
amphibole - a mineral or mineral variety belonging to the amphibole group
amphibole group - a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum