Mica is a distinctive and relatively common mineral that's widely used in industry right around the world. It can be found as a silvery inclusion within other minerals one example of which is seraphinite. Traces of mica have been found in cave paintings which date back 40,000 to 10,000 years BC.
Mica is part of a larger group known as silicate minerals or sheet silicates because it forms in distinctive layers. It's quite soft, flaky and light weight and both sheets and flakes are flexible. It's a heat-resistant mineral that doesn't conduct electricity and there are thirty seven different varieties of mica the most common of which includes muscovite and lepidolite.
The word lustre is used to describe the way in which light interacts with the surface of rocks and minerals. Mica exhibits a vitreous lustre which means it reflects light in a similar way to glass. In fact the term vitreous comes from the Latin "vitrum" meaning glass. Vitreous is also used to describe rocks and minerals which have a shiny or glossy appearance. Rocks and minerals described as having a dull lustre do not reflect light at all.
Weight (grams): 88
Size (cms): 7.1 x 5.8 x 1.3