Physics

Magnetite Definition Magnetite is a brown to black mineral that is strongly magnetic. It crystallizes in the cubic system and commonly occurs as small octahedrons.…

Serpentinite Definition Serpentinite is a metamorphic rock consisting almost entirely of minerals in the serpentine group. Serpentinite forms from the alteration of ferromagnesian silicate materials,…

Sphalerite Definition Sphalerite is a usually yellow-brown or brownish-black cubic mineral occurring either as single dodecahedral crystals or as granular masses. It is also called…

Dolomite Definition Dolomite is a gray, pink, or white rhombohedral mineral. Dolomite occurs in curved saddlelike crystals with a pearly to glassy luster. It is…

Marcasite Definition Marcasite is a light yellow to gray, metallic, orthorhombic mineral. Its chemical formula: FeS2 and sometimes called white iron pyrite. Marcasite is a…

Pyrrhotite Definition Pyrrhotite is a common bronze-coloured magnetic mineral consisting of ferrous sulphide in hexagonal crystalline form. It is also called magnetic pyrite, because the…

Perovskite Definition Perovskite is a yellow, brown, or greyish-black mineral form of calcium titanate with some rare-earth elements, which is used in certain high-temperature ceramic…

Platinum Definition Platinum (symbol Pt) is a soft, ductile, malleable, silver-white metallic element that usually occurs with osmium, iridium, palladium, or nickel. Its name is…

Molybdenum Definition Molybdenum (symbol Mo) A hard, silvery-white metallic element that resists corrosion and retains its strength at high temperatures. The name is from Neo-Latin…

Vanadium Definition Vanadium (symbol V) is a soft, bright-white metallic element that occurs naturally in several minerals. The elemental metal is rarely found in nature,…

Ilmenite Definition Ilmenite is a lustrous black to brownish rhombohedral mineral that is an ore of titanium. Ilmenite occurs in igneous rocks and is one…

Brookite Definition Brookite (Tio2) is a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. It is one…