ETYM Greek amphibolos doubtful, equivocal, from amphiballein to throw round, to doubt: cf. French amphibole. Haüy so named the genus from the great variety of color and composition assumed by the mineral.
A mineral or mineral variety belonging to the amphibole group.
Rock-forming silicate similar to asbestos and hornblende.
Any one of a large group of rock-forming silicate minerals with an internal structure based on double chains of silicon and oxygen, and with a general formula X2Y5Si8O22(O H)2; closely related to pyroxene. Amphiboles form orthorhombic, monoclinic, and triclinic crystals.
Amphiboles occur in a wide range of igneous and metamorphic rocks. Common examples are hornblende (X = Ca, Y = Mg, Fe, Al) and tremolite (X = Ca, Y = Mg).

Blue asbestos, essentially a sodium iron silicate.
A lavender-blue or light green mineral of the amphibole group that occurs in silky fibers and in massive form and is a type of asbestos — compare TIGEREYE.

ETYM German, from horn horn + blende blende.
A green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron.
Dark-colored variety of amphibole, containing aluminum and iron.
Green or black rock-forming mineral, one of the amphiboles; it is a hydrous silicate of calcium, iron, magnesium, and aluminum. Hornblende is found in both igneous and metamorphic rocks.

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