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Earth Science Facts

A red corundum that contains chromium impurities is ____. amethyst
The mineral ____ (FeS2) is also known as Fool's Gold. diamond
The mineral form of sodium chloride (NaCl) is ____ (rock salt). graphite
A blue corundum that contains iron and titanium is ____. halite
The hardest naturally-occurring mineral is ____ (hardness 10). pyrite
The minerals diamond and ____ are pure carbon allotropes. ruby
A purple quartz that contains manganese impurities is ____. sapphire
A very soft mineral (hardness 1) with a greasy feel is ____. talc