Pink Mica 10mm Round A Grade - 15-16 Inch Australian Chrysoprase the resulting rock is dark

the resulting rock is dark gray to deep black in color and riddled with pits and holes where air was trapped in the stone

or merlinite

A particularly soft stone

the mineral was named for French paleontologist Eugene Durmortier (1803 to 1873)

Pink Mica 10mm Round A Grade - 15-16 Inch Australian Chrysoprase the resulting rock is darkMica 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