Physics

Limonite Definition Limonite is a common brown, black, or yellow amorphous secondary mineral that consists of hydrated ferric oxides and is a source of iron.…

Allanite Definition Allanite is a rare black or brown mineral consisting of the hydrated silicate of calcium, aluminium, iron, cerium, lanthanum, and other rare earth…

Tanzanite Definition Tanzanite is the violet to blue form of the mineral zoisite.  It is a calcium alumina hydroxy silicate. The gemstone was discovered by…

Zoisite Definition Zoisite is a grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and…

Epidote Definition Epidote is a yellowish-green or blackish-green monoclinic mineral. Epidote occurs as formless grains or as prism-shaped crystals, and is found in limestones that…

Lawsonite Definition Lawsonite is an uncommon mineral that occurs at high pressures and low temperatures in regionally metamorphosed, low-grade, glaucophane-bearing schists. It can also form…

Hemimorphite Definition Hemimorphite is a white mineral consisting of hydrated zinc silicate in orthorhombic crystalline form: a common ore of zinc. It is also called…

Mullite Definition Mullite is a colourless mineral consisting of aluminium silicate in orthorhombic crystalline form: used as a refractory. It can form two stoichiometric forms…

Phlogopite Definition Phlogopite is a yellow to dark-brown mica. Phlogopite is monoclinic and is usually found in limestone. It is used in insulation. It is…

About Mica Definition Mica: It is any of a group of hydrous aluminosilicate minerals with the general formula (K,Na,Ca)(Mg,Fe,Li,Al)2-3(Al,Si)4O10(OH,F)2 that can be split easily into…

Muscovite Defintion Muscovite is a usually colorless to yellow or pale-gray mica. Muscovite is a monoclinic mineral and is found in igneous rocks, such as…

Biotite Definition Biotite is a dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. It was…