'Emeralds owe their beautiful green color to tiny amounts of this element, Cr, in their crystals'
chromium
WHAT A GEM!: Emeralds owe their beautiful green color to tiny amounts of this element, Cr, in their crystals
Emeralds owe their beautiful green color to tiny amounts of this element, Cr, in their crystals
Emeralds owe their beautiful green color to tiny amounts of this element, Cr, in their crystals
WHAT A GEM!
chromium
WHAT A GEM!