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hornblende

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.02 sec.
hornblende: see amphibole amphibole (ăm`fəbōl')
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hornblende

Any of a subgroup of amphibole minerals that are calcium-iron-magnesium-rich and monoclinic in crystal structure. Hornblende, whose generalized chemical formula is (Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22(OH)2, occurs widely in metamorphic and igneous rocks. Common hornblende is dark green to black in colour and usually found in middle-grade metamorphic rocks (formed under medium conditions of temperature and pressure). Such metamorphic rocks with abundant hornblende are called amphibolites.

hornblende
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
hornblende [′hȯrn‚blend]
(mineralogy)
A general name given to the monoclinic calcium amphiboles that form an extensive solid-solution series between the various metals in the generalized formula (Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2.


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Other minerals in the stone are feldspar, quartz and hornblende, which give the stone a light-green tone from different views.
Firm tells the story behind 'Freedom Stone' by Real Estate Weekly
About the same time Brian Mason, then curator of the National Collection of Meteorites, considered re-analysis of hornblende and pyrope from Kakanui, New Zealand.
Smithsonian Microbeam Standards by Jarosewich, Eugene / Journal of Research of the National Institute of Standards and Technology
5) are a grey, medium-to coarse-grained, undeformed hornblende tonalite or quartz diorite.
Geology of the Roman Catholic Basilica of St. John the Baptist, St. ... by Pollock, Jeff / Geoscience Canada
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