What minerals are in the amphibole group?

Minerals in this group:

What minerals are in the amphibole group?

Minerals in this group:

  • Tremolite.
  • Actinolite.
  • Cummingtonite.
  • Grunerite.
  • Hornblende.
  • Glaucophane.
  • Riebeckite.
  • Arfvedsinite.

What is the chemical composition of amphibole?

The prismatic cleavage angle of amphiboles is about 56° and 124°, while the pyroxene cleavage angle is about 87° and 93°….Physical Properties for Hornblende.

Chemical Classification Silicate
Chemical Composition (Ca,Na)2–3(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2
Crystal System Monoclinic

How do you detect amphibole in hand specimen?

Long prismatic, acicular, or fibrous crystal habit, Mohs hardness between 5 and 6, and two directions of cleavage intersecting at approximately 56° and 124° generally suffice to identify amphiboles in hand specimens.

What is the silicate structure of amphiboles?

Amphiboles are double chain silicates with general formula A0-1B2C5T8O22(OH,F)2. The double chain consists of (Si, Al)O4 tetrahedrons (T site) linked to form chains with the formula (Si, Al)4O11 that extend infinitely along the long-axis (c-axis) of the mineral.

What is amphibolite mineral?

amphibolite, a rock composed largely or dominantly of minerals of the amphibole group. The term has been applied to rocks of either igneous or metamorphic origin. In igneous rocks, the term hornblendite is more common and restrictive; hornblende is the most common amphibole and is typical of such rocks.

What is the classification of amphibole?

NEW SCHEMES FOR THE CLASSIFICATION OF AMPHIBOLES First, amphiboles are divided into two classes according to the dominant W species: (OH,F,Cl)-dominant amphiboles; O-dominant amphiboles.

Is amphibole an index mineral?


Type Metamorphic Rock
Index Minerals Amphibole
Color Black
Miscellaneous Salt and pepper appearance
Metamorphic Type Regional

What kind of rock is amphibole?

Amphibolite is a coarse-grained metamorphic rock that is composed mainly of green, brown, or black amphibole minerals and plagioclase feldspar. The amphiboles are usually members of the hornblende group.

Where can amphibolite be found?

Amphibolite is found around metamorphic and igneous rock intrusions that solidify between other rocks that are located within the Earth. Also, amphibolite has significant components found in both volcanic and plutonic rocks that range in composition from granitic to gabbroic.

What is the difference between amphibole and amphibolite?

What is amphibolite used for?

Amphibolite is a common dimension stone used in construction, paving, facing of buildings, especially because of its attractive textures, dark color, hardness and polishability and its ready availability.

Is amphibole a mineral?

amphibole, any of a group of common rock-forming silicate minerals.

How do you identify an amphibolite rock?

Often the easiest way to determine the true nature of an amphibolite is to inspect its field relationships; especially whether it is interfingered with other metasedimentary rocks, especially greywacke and other poorly sorted sedimentary rocks.

What is the classification of amphibolite?

Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar. It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite.

What does amphibolite look like?

What is another name of mineral amphibole?

Four of the amphibole minerals are among the minerals commonly called asbestos. These are: anthophyllite, riebeckite, the cummingtonite/grunerite series, and the actinolite/tremolite series.

Which mineral is commonly present in amphibolite facies?

Amphibole, diopside, epidote, plagioclase, almandine and grossular garnet, and wollastonite are minerals typically found in rocks of the amphibolite facies.

Does amphibolite have quartz?

The mineral composition of the amphibolites is simple and mostly contains hornblende and plagioclase, with variable amounts of anthophyllite, garnet, mica, quartz, and epidote.