Physics

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…

Chamosite Definition Chamosite is a monoclinic-prismatic mineral containing aluminum, hydrogen, iron, magnesium, oxygen, and silicon. It is a member of the Chlorite, and it forms…

Chlorite Group Definition Chlorite group is a group of mostly monoclinic (also triclinic or orthorhombic) micaceous phyllosilicate minerals with a structure consisting of T-O-T layers…

Nickel Definition Nickel is a silvery, hard, ductile metallic element that occurs in ores along with iron or magnesium. It occurs sparingly in nature in…

Chromite Definition Chromite is a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form, occurring principally in basic igneous rocks: the only…

Lava Tube Definition Lava tubes are the longest and most complicated of volcanic caves. They are the channels of rivers of lava that at some…

Volcanic Rock Definition Volcanic rock is an igneous rock of volcanic origin. It differs from other igneous rock by being of volcanic origin. Volcanic rocks…

Komatiite Definition Komatiite is relatively common in Archean greenstone belts, rare in Proterozoic belts, and virtually absent in younger regions. The type area is the…