Covellite (also know as covelline) is a crystalline form of copper(II) sulfide (CuS). In appearance it is an enchanting indigo blue. It is associated with chalcosite in zones of secondary enrichment (supergene) of copper sulfide deposits. Commonly found with and as coatings on chalcocite, chalcopyrite, bornite, enargite, pyrite, and other sulfides. Often occurs as pseudomorphic replacements after other minerals. Very rare occurrence as a volcanic sublimate at Mount Vesuvius the site of its discovery or first description by N. Covelli (1790 - 1829). This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance copper, metallic Atomic mass 63. ... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ... In mineralogy, shape and size give rise to descriptive terms applied to the typical appearance, or habit of crystals. ... Rose des Sables (Sand Rose), a formation of gypse crystal In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A regular hexagon A hexagon (also known as sexagon) is a polygon with six edges and six vertices. ... Cleaveage, in mineralogy, is the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types: Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes. ... A fracture is the separation of a body into two, or more, pieces under the action of stress. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... The refractive index of a material is the factor by which electromagnetic radiation is slowed down (relative to vacuum) when it travels inside the material. ... Pleochroism is an optical phenomenon where due to double refraction of light by a colored gem or crystal, the light is divided into two paths which are polarized at a 90° angle to each other. ... In any mineral, its streak refers to the color of its powder. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Fusibility is the ease with which a material will melt. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance copper, metallic Atomic mass 63. ... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ... Chalcocite, copper(I) sulfide (Cu2S), is an important copper mineral ore. ... Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. ... Bornite (Copper Iron Sulfide) Tarnish of Bornite Bornite is a sulfide mineral with chemical composition Cu5FeS4 that crystallizes in the cubic system. ... Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. ... The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. ...

References and external links

• Dana's Manual of Mineralogy ISBN 0471032883
• Mineralgalleries.com
• Webmineral
• Mindat.org