What is the classification of amphibole?
What is the classification of amphibole?
The amphibole supergroup is divided into two groups according to the dominant W species: W(OH,F,Cl)- dominant amphiboles and WO-dominant amphiboles (oxo-amphiboles).
Where is amphibole on the hardness scale?
between 5 and 6
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. The specific gravity values of amphiboles range from about 2.9 to 3.6.
What metamorphic grade is amphibolite?
Middle Grade
Amphibolite
| Type | Metamorphic Rock |
|---|---|
| Metamorphic Type | Regional |
| Metamorphic Grade | Middle Grade (Middle P – Middle T) |
| Parent Rock | Basalt; Mafic igneous rocks |
| Metamorphic Environment | Middle grade regional metamorphism along a convergent plate boundary |
What type of silicate is amphibole?
hydrous silicates
Amphiboles have hydroxyl groups in their structure and are considered to be hydrous silicates that are stable only in hydrous environments where water can be incorporated into the structure as (OH)-.
Are amphiboles double chain?
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 amphibole?
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.
What is the characteristics of amphibolite?
Amphibolite (/æmˈfɪbəlaɪt/) is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase feldspar, but with little or no quartz. It is typically dark-colored and dense, with a weakly foliated or schistose (flaky) structure.
