They flake easily and have a hardness between 2 and 3 on the Mohs hardness scale.
This phyllosilicate grouping of minerals consists of over 30 specific types, including glauconite and paragonite. On the molecular level, these minerals consist of silica tetrahedrons arranged into many connected 6 membered rings. These minerals are best known for their easy cleavage in one direction into sheets. They flake easily and have a hardness between 2 and 3 on the Mohs hardness scale. For ten points, name this group of minerals, the most prevalent of which are lepidolite, biotite, and muscovite.
This phyllosilicate grouping of minerals consists of over 30 specific types, including glauconite and paragonite.
{Mica} (pronounced MY-ca)