General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

Industry: Science

Add a new term

Contributors in General science

Become a Contributors

General science

Alunite

Science; General science

A mineral of composition KAl 3 (SO 4 ) 2 (OH) 6 . Alunite occurs in white to grey rhombohedral crystals or in fine-grained, compact masses. It has a hardness of 4 and a specific gravity of 2.6 - ...

A mineral with chemical composition Na 3 AlF 6 . Although it crystallises in the monoclinic system, cryolite has three directions of parting at nearly 90°, giving it a pseudocubic aspect. Hardness ...

Barite

Science; General science

A mineral with chemical composition BaSO 4 . It is isostructural with celestite, SrSO 4 , and anglesite, PbSO 4 . Barite is orthorhombic, space group Pnma, a = 0.887 nanometer, b = ...

Hemimorphite

Science; General science

A mineral sorosilicate having the composition Zn 4 Si 2 O 7 (OH) 2 · H 2 O; an ore of zinc. It crystallises in the orthorhombic system, pyramidal class, and thus the prismatic crystals have ...

Anhydrite

Science; General science

A mineral with the chemical composition CaSO 4 . Anhydrite occurs commonly in white and greyish granular masses, rarely in large, orthorhombic crystals (see illus. ). Fracture is uneven and lustre ...

Zincite

Science; General science

A mineral with composition ZnO (zinc oxide). It crystallises in the hexagonal system with a wurtzite-type structure. Thus its principal axis is polar and different forms appear at top and bottom of ...

Cerargyrite

Science; General science

A mineral with composition AgCl (see illus. ). Its structure is that of the isometric NaCl type, but well-formed cubic crystals are rare. The hardness is 2.5 on Mohs scale and specific gravity ...