Practice problem
Which of the following minerals are different varieties of quartz?
Amethyst
Chert
Olivine
Microcline
Flint
Hornblende
Rock crystal
Calcite
Agate
Sodalite
Tiger's eye
Muscovite
Lazurite
Jasper
Beryl
Plasma
Opal
Garnet
Chalcedony
Topaz
Type a concept, like “slope” or “photosynthesis”.