PetroViewer's stock Terrestrial sections are chosen with most consideration given to attractive, large, birefringent crystals.  The availability of many of these makes them most economical.

Ashland Feldspar mineral crystals seen through a PetroViewer
Blanchard Red mineral crystals seen through a PetroViewer
Peridotite mineral crystals seen through a PetroViewer
Blanchard White mineral crystals seen through a PetroViewer
California's Ward Creek Amphibole mineral crystals seen through a PetroViewer
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