Black Mica 10mm Round A Grade - 15-16 Inch DSforGB1032023 It is an aluminum borosilicate

It is an aluminum borosilicate mixed with iron

Metaphysically it is often used for stress relief and relaxation

but has been used historically to describe the transparent variety

greenish yellows

Each pendant will be the same size and shape

Black Mica 10mm Round A Grade - 15-16 Inch DSforGB1032023 It is an aluminum borosilicateMica 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