MUSCOVITE MICA SPECIMEN
A large and rustic Muscovite Mica Specimen. Featuring many mica blades clustered together. This lovely silvery Mineral possesses special properties like electrical, thermal and electromagnetic insulation and shielding. We have personally measured these properties with a Trifield meter for shielding and Mica is one of the best natural radiation shields. It has been used scientifically for these purposes for well over a hundred years. This specimen is mounted on a perspex pad for enhanced display and to make some handling possible. Mica can be flaky and comes apart in thin sheets much like flexible plastic. It is a popular and unusual mineral that appeals to people of all ages. Muscovite is just one variety of Mica, named for the Russian province of Muscovy, known for its sheet mica. The associated white mineral is probably Albite.
Minas Gerais, Brazil.
17cm x 12cm x 6cm, 1058g.
KAl2(AlSi3O10)(OH)2 MICA GROUP
The Micas are an important group of minerals. They represent the classic phyllosilicate mineral and are usually the first minerals to be thought of from this subclass of the Silicates Class. Micas are significant rock forming minerals being found in all three rock types: igneous, metamorphic and sedimentary. Because thin flakes of mica are generally flexible and brittle, it is surprising how resistant and durable mica crystals can be in withstanding high temperatures and pressures in metamorphic regimes.
Resisting the punishment of erosional environments. The term “mica” is so familiar to the general public that it is often considered a mineral in itself. Of course it is a group of minerals and most people who are knowledgeable about minerals know the three most common mica minerals. Muscovite, Biotite, and Lepidolite and perhaps a few of the less common Micas Glauconite, Paragonite, Phlogopite and Zinnwaldite. The Mica Group is actually a rather large group of minerals with over 30 members.