Yes, like the mineral Quartz is also a gem.
its an mineral
A sapphire gem is mainly composed of the mineral corundum and other trace mineral impurities that give it its color.
a diamond is a mineral (also is a gem)
Gem
Yes.
No, nickel is a mineral.
The web address of the Fallbrook Gem And Mineral Museum is: http://www.fgms.org
The web address of the Houston Gem And Mineral Society is: http://www.hgms.org
Ruby and sapphire are both gem varieties of the mineral corundum, an aluminum oxide.
The phone number of the Fallbrook Gem And Mineral Museum is: 760-723-4125.
The phone number of the Houston Gem And Mineral Society is: 281-530-0942.
a gem