from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a large group of structurally similar hydrated double silicate minerals, such as hornblende, containing various combinations of sodium, calcium, magnesium, iron, and aluminum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium/aluminum
from the GNU version of the Collaborative International Dictionary of English
- n. A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constituent of many crystalline rocks, as syenite, diorite, most varieties of trachyte, etc. See hornblende.
from The Century Dictionary and Cyclopedia
- n. A name given by Haüy to hornblende, from its resemblance to augite, for which it may readily be mistaken: now used as a general term to include all the varieties of which common hornblende is one. See hornblende.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a mineral or mineral variety belonging to the amphibole group
French, from Late Latin amphibolus, ambiguous, from Greek amphibolos, doubtful, from amphiballein, to throw on either side : amphi-, amphi- + ballein, to throw; see gwelə- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)