Discuss the physical properties of chief ores of zinc. 

Zinc is a metal that is used in a variety of applications, including the production of brass, zinc alloys, and galvanized steel. The chief ores of zinc are zinc sulfide (ZnS), also known as sphalerite, and zinc carbonate (ZnCO3), also known as calamine. The physical properties of these two ores are described in more detail below.

Zinc Sulfide (Sphalerite):

• Color: Zinc sulfide is usually yellow to brown in color, but can also be black, gray, or green.
• Luster: Zinc sulfide has a metallic luster.
• Crystal habit: Zinc sulfide is commonly found in the form of tetrahedrons, but can also occur as twins and cleavages.
• Specific gravity: The specific gravity of zinc sulfide is 4.1-4.9.
• Hardness: Zinc sulfide has a hardness of 3.5-4 on the Mohs scale.
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