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Biotite mica
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.
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.
biotite has a colorless streak
Biotite is one of the mica group of silicate minerals.
Biotite is definitely a mineral. It's in the same family as muscovite, another mineral in the mica family.
micas such as muscovite, biotite
it is not hard because you can split the mineral
An annite is a phyllosilicate mineral related to biotite.
Astrophyllite, biotite, and cafarsite
Granite has feldspar, quartz, biotite.
Biotite is a sheet silicate mineral in the mica group. It is formed from the metamorphosis of sedimentary rock under heat and pressure.
A good example of a mineral with basal cleavage are those from the mica group such as muscovite and biotite
Mica or silicate
biotite mica
A good example of a mineral with basal cleavage are those from the mica group such as muscovite and biotite
Many minerals separate into sheets. If the mineral has cleavage than it is common for it to separate into sheets. Mica separates into sheets.