Black Mica 10mm Round A Grade - 15-16 Inch DSforGB1032023 each cavity is slightly larger

each cavity is slightly larger (or smaller) than the other to give the user the ability to tighten the crimp properly

It is an aluminum borosilicate mixed with iron

greenish yellows

occurring 10

Yours is truly one-of-a-kind

Black Mica 10mm Round A Grade - 15-16 Inch DSforGB1032023 each cavity is slightly largerMica 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