Quartz
Quartz in PP light 
Quartz in XP light 
Off-center uniaxial interference figure of quartz 
Positive uniaxial interference figure of quartz
Epidote
Epidote in PP light 
Epidote in XP light 
Off-center biaxial optic axis figure of epidote 
Negative biaxial optic axis figure of Epidote
Topaz
Topaz in PP light 
Topaz in XP light 
Off-center optic axis figure of topaz 
Positive off-center optic axis figure of topaz
Clinozoisite
Clinozoisite in PP light 
Clinozoisite in XP light 
Off-center optic axis figure of clinozoisite 
Positive off-center optic axis figure of clinozoisite
Kyanite
Kyanite in PP light 
Kyanite in XP light 
Obtuse bisectrix interference figure of kyanite
Corundum
Corundum in PP light 
Corundum in XP light 
Off-center uniaxial interference figure of Corundum 
Negative uniaxial interference figure