Black Mica 8mm Round A Grade - 15-16 Inch Black Emerald is one of the

Emerald is one of the four “precious” gemstones

Agate has been discovered with artifacts from cultures of the Neolithic Period

These reproductions are designed in the traditional color

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

tan and ivory

Black Mica 8mm Round A Grade - 15-16 Inch Black Emerald is one of theMica 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