Black Mica 8mm Round A Grade - 15-16 Inch Black It occurs in bright turquoise

It occurs in bright turquoise blues and darker blues as well as rust reds

Emerald is one of the four “precious” gemstones

Approximate Size:

famed mineralogist and jeweler George Frederick Kunz

The different species are pyrope

Black Mica 8mm Round A Grade - 15-16 Inch Black It occurs in bright turquoiseMica 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