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Diaspore also known as diasporite, empholite, kayserite, or tanatarite, is an aluminum oxide hydroxide mineral, α-AlO(OH), crystallizing in the orthorhombic system and isomorphous with goethite.…

Diadochite is a phospho-sulfate mineral. It is a phosphosulfate mineral with a greenish-yellow to brown color. It is a secondary mineral formed by the weathering…

Diaboleite is a blue-colored mineral, formula Pb2CuCl2(OH)4. It was first discovered in 1923 from the Higher Pitts, Mendip Hills, Somersetshire, England. The mineral has since…

Features of Good Selection Process The purpose of the selection process is to pick up the most suitable candidate who would meet the requirements of…

Devilline is a sulfate mineral with the chemical formula CaCu4(SO4)2(OH)6•3H2O. The name originates from the French chemist’s name, Henri Etienne Sainte-Claire Deville (1818–1881). It forms…

Descloizite is a mineral consisting of a basic vanadate chiefly of lead and zinc and varying in color from cherry red to brown and black.…

Derriksite is an orthorhombic-pyramidal mineral containing copper, hydrogen, oxygen, selenium, and uranium. It is a very rare uranium mineral with the chemical formula Cu4(UO2)(SeO3)2(OH)6•H2O. It…

Socialization is a process by which culture is transmitted to the younger generation and men learn the rules and practices of social groups to which…

Demesmaekerite is a triclinic-pinacoidal mineral containing copper, hydrogen, lead, oxygen, selenium, and uranium. It is a uranium mineral with the chemical formula: Pb2Cu5(UO2)2(SeO3)6(OH)6•2H2O. It is…

Delvauxite, also known as borickite, is a yellow to brown to dark brown amorphous mineral, sometimes forming a botryoidal mass. It is a mineral approximately…

Delafossite is a copper iron oxide mineral with formula CuFeO2 or Cu1+Fe3+O2. It is a mineral consisting of an oxide of copper and iron formerly…

Apollonius’ theorem is an elementary geometry theorem relating the length of a median of a triangle to the lengths of its sides. It states that “the sum…