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Apatite, at 5 on the Mohs scale, is only slightly harder than opal. Abundant on the planet, gem quality apatite is rare. It is usually intensely blue to blue green.Â
Apatite, at 5 on the Mohs scale, is only slightly harder than opal. Abundant on the planet, gem quality apatite is rare. It is usually intensely blue to blue green.Â
