precious stone
abstract
aggregate
aggregation
amulet
atomic structure
barite
barium sulphate
baryte
barytes
closeup
composition
concentration
connate
crystallization
crystals
cube shaped
diffraction
dispersion
glazed
gold
gold cubes
grown together
hardness
inorganic
iron pyrite
iron sulfide
irregular
irregular shapes
irregular stripes
luminescence
lustre
metallic luster
milk white
mineral stones
mineralogy
minerals
morocco
opalescence
peru
polished stone
pyrite
pyros
rhomb
rough texture
semiprecious
structure
surface
thermo luminescence
vitreous lustre