| Amphibole (amphibole) |
|---|
| n. | ( m"f***ibreve]*b l) |
|---|
| Am"phi*bole |
| [Gr. 'amfi`bolos doubtful, equivocal, fr.
'amfiba`llein to throw round, to doubt: cf. F. amphibole.
Haüy so named the genus from the great variety of color and
composition assumed by the mineral.] (Min.) |
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.
|
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 