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What type of rock is biotite?
What is hornblende & biotite in granite?
What is biotite granite?
What are the characteristics of biotite?
Biotite in granite tends to be poorer in magnesium than the biotite found in its volcanic equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre . Biotite is occasionally found in large cleavable crystals, especially in pegmatite veins, as in New England , Virginia and North Carolina USA.
- Massive to platy
- Prismatic (2/m), (same H-M symbol)
- 2.5–3.0
- Monoclinic
Biotite is a group of sheet silicate minerals with similar physical properties and chemical compositions. It is a common rock-forming mineral in granite, diorite, gabbro, and other igneous rocks, and also forms under metamorphic conditions.
Sep 2, 2023 · Biotite is a dark-colored silicate mineral that forms in igneous and metamorphic rocks, such as granite, diorite, and schist. Learn about its properties, formation, occurrence, and uses in geology science.
- Dark mica
- Vitreous
- Black, dark green, dark brown
- White to gray, flakes often produced
It is an abundant mineral, calculated to account for about 7 percent of the continental crust. It is found in the lava from Mount Vesuvius, the Monzoni intrusive complex of the Dolomites, and in granite, pegmatite, and schist. Biotite is so common that it's considered a rock-forming mineral.
Jan 4, 2024 · Biotite granite is rich in biotite mica, which gives it a dark color, often in shades of brown or black. This variety is known for its striking appearance and is frequently used in...
Aug 26, 2023 · Granite is a common intrusive rock composed of feldspar, quartz, and mica, including biotite and muscovite. Learn about its formation, classification, color variations, and applications in construction and building materials.
Biotite is a common form of mica and a member of the biotite mineral group. It is found in igneous rocks such as granite, and has a flaky habit, sectile tenacity, and black or dark green color.
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