Biotite is definitely a mineral. It's in the same family as muscovite, another mineral in the mica family.
Is it a solid? Does it have a crystalline structure? Is it a naturally occurring? Does it have a defined chemical composition?
micas such as muscovite, biotite
it is not hard because you can split the mineral
Biotite is a sheet silicate mineral in the mica group. It is formed from the metamorphosis of sedimentary rock under heat and pressure.
biotite mica
Is it a solid? Does it have a crystalline structure? Is it a naturally occurring? Does it have a defined chemical composition?
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
Many minerals separate into sheets. If the mineral has cleavage than it is common for it to separate into sheets. Mica separates into sheets.
A good example of a mineral with basal cleavage are those from the mica group such as muscovite and biotite