Raw Gold Muscovite Mica Specimens - Choose your quantity! Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Avg Size Range: (2 to 6 Inches Long) Sizes Vary Raw mica may shed small crystals as layers settle; handle with care. Mica refers to a group of silicate minerals that tend to form in flexible or brittle layers. These layers often form as large unbroken sheets within other rock deposits, or as small reflective flakes in igneous or metamorphic stones like granite or lepidolite. Muscovite mica, the most common variety, tends to be colorless or yellow-grey in color, but it can also turn green if tinted with chromium. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.