Black Mica Muscovite 12mm Round - 15-16 Inch Size_2-6mm Grandidierite is a very rare

Grandidierite is a very rare

Stromeyer in 1819 and was named after the Greek words eu dialytos meaning

In any case

Stone Type: Madagascar Agate

Black Mica Muscovite 12mm Round - 15-16 Inch Size_2-6mm Grandidierite is a very rareMica is a mineral name given to a group of minerals that are physically and chemically similar. They are all silicate minerals, known as sheet silicates because they form in distinct layers. Micas are fairly light and relatively soft, and the sheets and flakes of mica are flexible. Mica is heat resistant and does not conduct electricity. There are 37 different mica minerals. The most common include: purple lepidolite, black biotite, brown phlogopite