QUIZ HUB: Knowledge Is Empowering

Earth Science Facts

A purple quartz that contains manganese impurities is ____. amethyst
Pure ____ (SiO2) is colorless and has a hardness of 7. emerald
A red corundum that contains chromium impurities is ____. graphite
The mineral form of sodium chloride (NaCl) is ____ (rock salt). halite
The minerals diamond and ____ are pure carbon allotropes. quartz
A green beryl that contains chromium impurities is ____. ruby
A very soft mineral (hardness 1) with a greasy feel is ____. sapphire
A blue corundum that contains iron and titanium is ____. talc