calcite - cool pink fluorescent and phosphorescent calcite - cleavage rhomb from the Challenger Cave system, Nuevo Leon, Mexico The name muscovite was first

The name muscovite was first used in 1794 in A System of Mineralogy by Johann Gottfried Schmeisser

The mineral was called "cyanite" by mineralogists using the French spelling

with its natural purplish oxidized surface

The pen is 5" long

This medium-grained sandstone is composed primarily of quartz with feldspar and some biotite

calcite - cool pink fluorescent and phosphorescent calcite - cleavage rhomb from the Challenger Cave system, Nuevo Leon, Mexico The name muscovite was firstCalcite, CaCO3, is an extremely common rock forming mineral. In pegmatites it forms large masses and it makes up some limestones almost entirely. It has a large variety of crystal forms, but these do not include the rhombus shaped pieces that are sold as calcite crystals. The rhombs are produced by cleaving calcite in three directions between rows of atoms. When calcite is free of impurities and is optically clear, it exhibits double refraction. When