[ hawrn-blend ]
/ ˈhɔrnˌblɛnd /


a dark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate.

Origin of hornblende

From German, dating back to 1760–70; see origin at horn, blende

Related forms

horn·blen·dic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hornblende

British Dictionary definitions for hornblende


/ (ˈhɔːnˌblɛnd) /


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

Derived Forms

hornblendic, adjective

Word Origin for hornblende

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

Science definitions for hornblende


[ hôrnblĕnd′ ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.