Amphiboles are minerals of either igneous or metamorphic origin. Amphiboles are more common in intermediate to felsic igneous rocks than in mafic igneous rocks, [8] because the higher silica and dissolved water content of the more evolved magmas favors formation of amphiboles rather than pyroxenes. [9] .

amphibole, any of a group of common rock-forming silicate minerals. Amphiboles are found principally in metamorphic and igneous rocks. They occur in many metamorphic rocks, especially those derived from mafic igneous rocks (those containing dark-coloured ferromagnesian minerals) and siliceous dolomites.

2023年4月23日 · Amphibole is an crucial institution of usually darkish-colored, inosilicate minerals, forming prism or needlelike crystals,composed of double chain SiO4 tetrahedra, connected at the vertices and normally containing ions of iron and/or magnesium in their systems. Amphiboles may be inexperienced, black, colorless, white, yellow, blue, or brown.

The name amphibole (Greek αμφιβολος - amphibolos meaning 'ambiguous') was used by René Just Haüy to include tremolite, actinolite, tourmaline, and hornblende. The group was so named by Haüy in allusion to the protean variety, in composition and appearance, assumed by its minerals. This term has since been applied to the whole group. (Wikipedia).

2020年2月10日 · Amphiboles occur in both metamorphic and igneous rocks, frequently as dark elongated grains and crystals embedded in the rock, but can occasionally form well developed crystals. Such crystals are most commonly found in pegmatites and as porphyroblasts in igneous rocks, marbles/skarns and veins within metamorphic rocks.

Amphibole minerals are generally dark-colored, hard, and are so similar in appearance that often they can only be distinguished from one another by examination under an optical microscope.

Amphiboles are a major group of hydrous minerals that occur in a wide range of rock types. They occur predominantly in metamorphic and igneous rocks of the Earth's crust and upper mantle. Two metamorphic facies are defined by their characteristic amphiboles.

Amphiboles have a wide range of chemical substitutions. Their chemical composition and general characteristics are very similar to the pyroxene group. They are an important constituent in a variety of plutonic and volcanic igneous rocks. Igneous amphiboles intermediate in composition are referred to as hornblende.

The term amphibole, derived from the Greek amphibolos meaning “ambiguous,” was first used by Haüy in 1801. The complex nature of amphibole compositions is easily appreciated when it is remembered that all the eight elements that, together, make up 98% of the earth's crust, are present in common amphiboles.

amphibole, Click Here to see full-size table Any of a group of common rock-forming hydrous silicate minerals. Amphiboles occur in many igneous rocks as minor and major constituents …