What color streak does biotite mica have?
colorless
Biotite, also called black mica (K(Mg,Fe)3(AlSi3)O10(OH)2), contains iron and magnesium and is commonly dark green or brown to black, although it may be shades of yellow or brown; its streak is colorless. Thin sheets generally have a smoky color.
Does biotite mica scratch quartz?
(3) Muscovite mica scratches quartz, but biotite mica does not. (4) Muscovite mica cleaves into thin sheets, but biotite mica does not.
What is the color of biotite?
Color – generally pleochroic, typically in shades of brown, but also can be yellow, green or red. Common biotite is one of the most strongly colored minerals seen in thin section. For biotite with low Fe-content (phlogopite), coloration is more subtle (clear, light browns and tans).
Does biotite have quartz?
The biotite has a pebbly texture and micaceous cleavage. The right half of the view contains a large grain of clear to cloudy K-feldspar. The clear grains with low birefringence left of the K-feldspar are quartz, and minor plagioclase (feldspar) is in the extreme lower left.
What is mica streak?
Streak: colorless. Luster: vitreous to pearly. Transparency: transparent, translucent, opaque.
What is the streak color of feldspar?
white
| Feldspar | |
|---|---|
| Fracture | along cleavage planes |
| Mohs scale hardness | 6.0–6.5 |
| Luster | Vitreous |
| Streak | white |
What mineral is pink or white wavy lines?
Mineral Classification Tables
| Table 1. Nonmetallic Luster—Light Color | ||
|---|---|---|
| Typical Color | Hardness | Mineral Name |
| pink or white | 3 | dolomite |
| colorless or white | 2.5–3 | halite |
| colorless or white | 2.5 | muscovite |
Is biotite a mica?
Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties.
What type of rock is biotite mica?
igneous
biotite, also called black mica, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks.
Is biotite mica magnetic?
The platy morphology of biotite facilitates magnetic measurements with the applied field either in the plane of the sheets (Xe⊥ ) or perpendicular to the plane (Xe∥). Thus, biotite has both magnetic and structural two‐dimensional aspects.
What is the streak color of calcite?
White
| Calcite | |
|---|---|
| Mohs scale hardness | 3 (defining mineral) |
| Luster | Vitreous to pearly on cleavage surfaces |
| Streak | White |
| Diaphaneity | Transparent to translucent |
How does biotite mica differ from muscovite mica?
How are the minerals biotite mica and muscovite mica different? (1) Biotite mica is colorless, but muscovite mica is not. (2) Biotite mica contains iron and/or magnesium, but muscovite mica does not. (3) Muscovite mica scratches quartz, but biotite mica does not. (4) Muscovite mica cleaves into thin sheets, but biotite mica does not.
What is biotite used for?
Biotite, like Muscovite, is a very poor conductor of heat and electricity, and is thus used as an insulator for various electrical products and semiconductors. Biotite is found in abundance worldwide, but collectors specimens are not common and come from few localities.
What is the hardness of biotite mica?
K(Mg,Fe2+)3(Al,Fe3+)[(Al,Si)3O10](OH,F)2. Hardness: 2.5 – 3. Biotite is a very common form of mica. It is named in honor Jean Baptiste Biot (1774 – 1862), a French physicist, mathematician, and astronomer who researched the mica minerals for their optical properties.
What is the streak color of mica?
The color of biotite may be black, dark green, or dark brown, and its streak ranges from white to gray with flakes often produced. The crystal system is monoclinic, and Its luster is vitreous, cleavge basal or perfect, on the Mohs Hardness Scale it scores between 2.5 and 3, and its specific gravity is 2.7 to 3.4.