Identification Corundum (Ruby and Sapphire) Identification Sheet The Mohs 9 anchor at the top of every field kit: ruby and sapphire are the same mineral, identified by extreme hardness and barrel-shaped…
Identification Topaz Identification Sheet The Mohs 8 reference mineral: hard enough to scratch quartz, with perfect basal cleavage and striated prismatic crystals.
Identification Olivine (Peridot) Identification Sheet The green mineral that makes up much of the Earth's mantle — and surfaces as gemstone peridot when conditions align.
Identification Muscovite Mica Identification Sheet The sparkly sheet mineral in every granite — and the one that makes students understand cleavage for the first time.
