anisotropic
birefringent
bright
calcite
calcium
calcium carbonate
carbonate
clear
close
collection
crystal
crystalline
cube
decorative
gemmology
geology
healing crystals
iceland
iceland crystal
iceland spar
lustrous
macro
material
mineral
natural
nature
object
optical calcite
optics
orange
piece
polarization
raw
rock
rough
sample
shiny
spar
stone
structure
sunrise
sunset
surface cracks
texture
textured
translucent
transparent
unpolished
vitreous
white