HIGH SCHOOL ACE: Knowledge Is Empowering

Earth Science Quiz

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