Questions and answers

What is the difference between clinopyroxene and orthopyroxene?

What is the difference between clinopyroxene and orthopyroxene?

Clinopyroxene has higher birefringence and non-parallel extinction. Andalusite is very similar but does not occur in the same kinds of rocks. These four views show a spectacular rock from near Kazabazua, Quebec. It contains primarily cordierite and orthopyroxene with lesser amounts of biotite.

How can you identify orthopyroxene in a thin section?

Identification: Orthopyroxene -Enstatite- (Mg,Fe)2Si2O6 – Thin section: Plane light: Pale colored with greenish to pinkish pleochroism. Pure enstatite can be colorless, higher Fe contents correspond to darker colors. High positive relief.

What is the structure of pyroxene?

Within hand specimens, pyroxene can generally be identified by the following characteristics: two directions of cleavage intersecting at roughly right angles (approximately 87° and 93°), stubby prismatic crystal habit with nearly square cross sections perpendicular to cleavage directions, and a Mohs hardness between 5 …

What is the chemical formula for 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

What is the crystal shape of a pyroxene mineral?

Pyroxenes crystallize in both the orthorhombic and monoclinic crystal systems. Typically pyroxenes occur as stubby prismatic crystals. They are chemically analogous to the amphiboles except that, as discussed above, hydroxyls are absent in the pyroxene structure.

Where is enstatite most commonly found?

Enstatite is a relatively common mineral and is found in metamorphic and some igneous rocks as well as in stony and iron meteorites. It forms a solid solution series with the minerals hypersthene and ferrosilite .

Is Clinopyroxene a mineral?

About Clinopyroxene SubgroupHide A subgroup name for monoclinic Pyroxene Group minerals. Compare Orthopyroxene Subgroup. The most widespread members include aegirine, augite, hedenbergite and diopside. Compare UM2004-50-SiO:AlFeGd.

How is amphibole used in everyday life?

It is used as paving stones and as a veneer or facing on buildings (both for interior and exterior use). It is also used as crushed stone for the usual crushed stone applications such as road and railroad bed construction. In this application it is used locally, near the source of the amphibolite.