hornblenden.

Brit.

/ˈhɔːnblɛnd/, U.S.

/ˈhɔrnˌblɛnd/

Forms: Also hornblend.

Etymology: < German hornblende, < horn horn + blende n.

Mineralogy.

A mineral closely allied to augite, and having as its chief constituents silica, magnesia, and lime. It is a constituent of many rocks, as granite, syenite, and diorite, and has numerous varieties, aluminous and non-aluminous, as actinolite, antholite, asbestos, dannemorite, nephrite, tremolite, etc., which are sometimes all included under the name amphibole n.¹; it is usually of a dark brown, black, or greenish black colour.

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > amphibole (double chain) > [noun] > hornblende

hornblende1770

siderite1811

1770 G. von Engeström & E. M. da Costa tr. A. F. Cronstedt Ess. Syst. Mineral. 95 The hornblende of the Swedes.

1794 R. Kirwan Elements Mineral. (ed. 2) I. 215 The great weight of the stone called hornblende made the miners at first imagine it contained some metal, but finding none except iron they called it blind.

1847 Ld. Tennyson Princess iii. 64 Chattering stony names Of shale and hornblende, rag and trap and tuff, Amygdaloid and trachyte.

1876 D. Page Adv. Text-bk. Geol. (ed. 6) v. 104 Hornblende is of a dark or dark-green colour, with a horny glistening lustre.

Compounds

C1. attributive. Of hornblende, as hornblende boulder, etc.; containing or having hornblende as a chief constituent, hornblendic, as hornblende basalt, hornblende granite, hornblende porphyry, hornblende syenite.

ΚΠ

1794 R. Kirwan Elements Mineral. (ed. 2) I. 354 Hornblende Porphyry.

1862 B. Taylor Poet's Jrnl., 2nd Eve 23 Through hornblende bowlders, where the discus flung.

C2.

hornblende andesite n. (see quot. 1885).

ΚΠ

1885 A. Geikie Text-bk. Geol. (1893) 167 Hornblende-andesite consists of a triclinic felspar with hornblende, augite or mica... Hornblende-andesite is a volcanic rock of Tertiary and post-Tertiary date.

Categories »

hornblende gabbro n. a variety of gabbro in which the diallage is more or less replaced by horneblende.

hornblende rock n. a green-stone consisting chiefly of hornblende.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > greenstone > varieties of

mulatto1816

hornblende rock1821

diorite1826

hypersthene rock1838

hypersthenite1849

norite1853

aphanite1863

hyperite1863

1821 J. Macculloch Geol. Classif. Rocks 298 Wherever hornblende rock occurs, it is only a portion of those beds of which the greater parts present the same characters as hornblende schist.

hornblende schist n. hornblende rock of a schistose nature.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > schist > varieties of

hammochrysos1706

hornslate1791

hornblende slate1794

horn porphyry1794

horn-schist1799

mica-slate1809

green schist1817

hornblende schist1821

kinzigite1878

phyllite1878

spilosite1882

mylonite1885

1821Hornblende schist [see hornblende rock n.].

hornblende slate n. = hornblende schist n.

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