from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A green to black amphibolic mineral, CaNa(Mg,Fe)4(Al,Fe,Ti)3Si6O22(OH,F)2, formed in the late stages of cooling in igneous rock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A green to black amphibole mineral, of complex structure, formed in the late stages of cooling in igneous rock.
from the GNU version of the Collaborative International Dictionary of English
- n. The common black, or dark green or brown, variety of amphibole. (See amphibole.) It belongs to the aluminous division of the species, and is also characterized by its containing considerable iron. Also used as a general term to include the whole species.
from The Century Dictionary and Cyclopedia
- n. A common mineral, crystallizing in the monoclinic system with a prismatic angle of 124½°.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron
This stone is a volcanic rock called hornblende, of very fine grain, with minute specks of mica.
An examination of the stones which fell at Fort de France showed them to be of a variety of lava called hornblende and andesite.
The remaining rocks from here are richer in lime and iron, and show a series of gradual transitions from micacious granite, through grano-diorite to quartz diorite, with considerable quantities of dark mica, and green hornblende.
Most significant is the presence of the Sinharaja Basic Zone, consisting of hornblende, pyriclasts, basic charnokites, pyroxene amphibolites and scapolite-bearing calc-granulites and blended with small amounts of quartzites, garnet-biotite gneisses and intermediate charnokites.
Elsewhere, Precambrian granitic gneiss, Precambrian hornblende gneiss, and fanglomerate are common (Berg and others, 1980).
Strange, scholastic, didactic, passionless, bloodless man, who denotes classes of souls as a botanist disposes of a carex, and visits doleful hells as a stratum of chalk or hornblende!
Six widespread tephras ~0.1–1.0 cm thick with rhyolitic to dacitic glass and/or phenocrysts of feldspar or hornblende are preserved in the glacial lakes of Las Cajas National Park, southern Ecuador.
Dark trappean rocks full of hornblende have in many places burst through these schists, and appear in nodules on the surface.
About Losito we found the trap had given place to hornblende schist, mica schist, and various schorly rocks.
On some of the hills the rocks were shivered into irregular pieces, and displayed crystals of quartz, small laminae of mica, and occasionally hornblende.