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Biotite is dark due to its high iron and magnesium content, which contributes to its strong absorption of light in the visible spectrum. The presence of these elements, along with its layered silicate structure, results in a black to dark brown appearance. Additionally, the presence of certain trace elements can further enhance its dark coloration.
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What physical properties distinguish biotite from muscovite?
Biotite is typically darker in color compared to muscovite, and it has higher iron and magnesium content, which gives it a higher specific gravity. Biotite also exhibits stronger pleochroism compared to muscovite, meaning it shows more noticeable color variations when viewed from different angles. Additionally, biotite has a higher tendency to cleave into thin, flexible sheets compared to muscovite.
What is the composition that contain many dark silicate minerals and that also are rich in magnesium and iron?
biotite
What color is the streak of biotite?
biotite has a colorless streak
What color is the Luster of biotite?
Luster is not a color, but a visible characteristic of the mineral's reflection of light off it's surface. In this case, the color of biotite is dark brown to black, but it's luster would be described as vitreous or glassy.
The dark colored mineral composing a rock is?
likely to be either biotite, amphibole, or magnetite. These minerals are known for their dark color and are commonly found in igneous and metamorphic rocks.
What is a biotite?
A biotite is a variety of dark brown mica, a mixed aluinosilicate and fluoride of potassium, magnesium and iron.
What element is principally responsible for making olivine pyroxene amphibole and biotite dark?
Iron is principally responsible for making olivine, pyroxene, amphibole, and biotite dark in color. Iron impurities in these minerals can give them a dark green, black, or brown coloration.
What mineral is known as black mica?
Black mica is also known as biotite. It is a common phyllosilicate mineral that is part of the mica group. Biotite is typically black or dark brown in color and is composed of potassium, iron, magnesium, aluminum, silicon, and hydrogen.
What physical properties distinguish biotite from muscovite?
Biotite is typically darker in color compared to muscovite, and it has higher iron and magnesium content, which gives it a higher specific gravity. Biotite also exhibits stronger pleochroism compared to muscovite, meaning it shows more noticeable color variations when viewed from different angles. Additionally, biotite has a higher tendency to cleave into thin, flexible sheets compared to muscovite.
What is the composition that contain many dark silicate minerals and that also are rich in magnesium and iron?
biotite
What is the name of dark colored mica?
The dark colored mica is called biotite. It is a common mineral found in igneous and metamorphic rocks and is known for its dark brown to black color.
What color is the streak of biotite?
biotite has a colorless streak
What color is the Luster of biotite?
Luster is not a color, but a visible characteristic of the mineral's reflection of light off it's surface. In this case, the color of biotite is dark brown to black, but it's luster would be described as vitreous or glassy.
The dark colored mineral composing a rock is?
likely to be either biotite, amphibole, or magnetite. These minerals are known for their dark color and are commonly found in igneous and metamorphic rocks.
What two minerals are found in gneiss that contain iron and magnesium?
The two minerals commonly found in gneiss that contain iron and magnesium are biotite, a dark-colored mica mineral rich in iron and magnesium, and amphibole, a group of dark-colored mineral silicates that also contain iron and magnesium.
What is the luster of biotite?
Luster is not a color, but a visible characteristic of the mineral's reflection of light off it's surface. In this case, the color of biotite is dark brown to black, but it's luster would be described as vitreous or glassy.
Is a gabbro a intrusive rock or a extrusive rock?
it is an intrusive igneous rock with composition equivalent of basalt.it is dark colored due to high concentration of dark minerals;olivine,biotite,hornblende.
