Learn about Ruby
red corundum known for vivid pigeon-blood color, 9 Mohs hardness, and dramatic matrix on marble or zoisite; prized for rarity and notable localities.Khyber Pakhtunkhwa Province
A collector's guide to Khyber Pakhtunkhwa Province, Pakistan: its geology, mining history and notable minerals, illustrated with the 57 specimens documented from this locality on EarthWonders.
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