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Cosa (chi) è Amphibole - definizione
ANY OF A GROUP OF DOUBLE CHAIN INOSILICATES (MINERALOGY)
Grammatite; Amphiboles; Amphibole Asbestos; Asbestos, amphibole; Amphibole group; Si8O22
 1.jpg?width=200 "Amphibolite from Warrensburg, Adirondack Mountains, New York State, USA")
![Photomicrographs]] of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.](https://commons.wikimedia.org/wiki/Special:FilePath/Thin section microscopy Siilinjärvi R636 6335 amphibole.jpg?width=200 "Photomicrographs]] of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.")
![Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.](https://commons.wikimedia.org/wiki/Special:FilePath/Amphibole 100.jpg?width=200 "Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.")
![Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.](https://commons.wikimedia.org/wiki/Special:FilePath/Amphibole 010.jpg?width=200 "Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.")
![Amphibole structure looking along the [001] axis. Silicon ions are emphasized. Two "I-beams" are outlined in green.](https://commons.wikimedia.org/wiki/Special:FilePath/Amphibole 001.jpg?width=200 "Amphibole structure looking along the [001] axis. Silicon ions are emphasized. Two \"I-beams\" are outlined in green.")
Amphibole
·noun 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.
amphibole
['amf?b??l]
¦ noun any of a class of rock-forming silicate or aluminosilicate minerals typically occurring as fibrous or columnar crystals.
Origin
C19: from Fr., from L. amphibolus 'ambiguous' (because of the varied structure of the minerals).
Amphibole
Amphibole () is a group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their structures. Its IMA symbol is Amp.
Wikipedia
Amphibole
Amphibole () is a group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain SiO
4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their structures. Its IMA symbol is Amp. Amphiboles can be green, black, colorless, white, yellow, blue, or brown. The International Mineralogical Association currently classifies amphiboles as a mineral supergroup, within which are two groups and several subgroups.
