Phlogopite mica

Phlogopite Mica Natural Mineral From Perth Ontario Canada Size- 6.4cm x 4.4cm x 3.2cm Weight- 67g You will receive the item in the photo Phlogopite is a magnesium rich mineral in the mica group. It typically forms in contact metamorphic marbles and specific silica poor ultramafic igneous rocks. Mineral class- silicates Crystal system-monoclinic Rock formation- Contact metamorphism: it commonly crystallizes in metamorphosed silica rich dolomitic marbles and limestones,often associated with minerals like diopside,spinel and Grossular garnet. Ultramafic and alkaline igneous rocks: As a primary magmatic mineral,phlogopite forms at great depths and high vapour pressures. It appears as phenocrysts or within the ground mass in rocks like kimberlites,lamproites and carbonatites.