Question

What is the formula of copper glance and zinc blend?

Answer 1

Copper glance and zinc blende are the principal ores of metals copper and zinc respectively. Metallic ores are naturally occurring and mainly consist of the corresponding oxide, sulfide or carbonate of the metal.

Complete answer:
Most abundantly available metallic elements are found in the Earth’s crust. These metals cannot be naturally extracted in their pure elemental form due to their high reactivity and an excess of other substances in the atmosphere like oxygen, sulphur and carbon.
The drastic conditions of high temperature and pressure inside the earth’s crust facilitates the reaction between metals and the reactive gases present around them. As a result, metals can only be derived or extracted from their respective ores that contain their oxide, sulfides or carbonates.
The process that involves the extraction and isolation of these elements from their ores through a series of concentrating and cleaning steps is known as a metallurgical process.
Copper glance is one of the principal ores of copper with the molecular formula $C{u_2}S$ in which copper exists as its sulfide.
Zinc blende is one the principal ores of Zinc with molecular formula $ZnS$ in which zinc is present as its sulfide.

Note:
Copper is a transition metal and therefore has the ability to show variable oxidation state in various compounds. The salts containing $C{u^ + }$ ions are cuprous salts and those containing $C{u^{2 + }}$ ions are called cupric salts. Copper glance has the formula $C{u_2}S$ suggesting that ${S^{2 - }}$ ion is bonded to two $C{u^ + }$ ions making it a cuprous compound.