mineral background. cordierite stone macro detail. geology gemstone.

almandine background basalt clinopyroxene close cobble coesite collection cordierite crust crystal dense facies garnet gem gemstone geological geology green kyanite macro metamorphic metamorphism mineral natural nature nordfjord norway norwegian oceanic omphacite ornamental plate pressure protolith purple pyrope pyropite pyroxene quartz rock sample specimen stone subduction tectonics ultrahigh