Quartz and green tourmaline crystals
Schorl tourmaline crystal stone
Schorl and quartz crystals in groundmass
Tourmaline crystals in quartz
Tourmaline gemstones in quartz
Tourmaline in gneiss rock
Schorl variety of Tourmaline, Namibia
Black tourmaline in mica schist
Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Hawk's Eye quartz stone
Tourmaline quartz
Tourmaline in quartz
Blue tourmaline crystals
Tourmaline gemstone
Pink tourmaline crystals growing on mica
Tourmaline crystals
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Tourmaline specimen
Tourmaline crystal
Tourmaline
Crystals of green toumaline and pink lepidolite
Luxulyanite, thin section, LM
Tourmaline gem, 365 carat
Tourmaline gem
Watermelon tourmaline
Tourmaline gemstones
Tourmaline pegmatite
Tourmaline Pegmatite
Raw tourmaline crystal
Tourmaline gemstones and crystal
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Tourmaline mica in slate
Elbaite mineral (tourmaline)
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Tourmaline on quartz
Elbaite mineral
Tourmaline schorl specimen
Tourmaline mineral, light micrograph
Granite specimen
Elbaite on albite and quartz
Opal gemstone
Dravite mineral
Schorl (black Toutmaline)
Tourmaline crystals in quartzite
Tourmaline in pegmatite host rock
Schorl, the black variety of Tourmaline
Quartz crystals
Rubellite tourmaline pendant
Tourmaline embedded in feldspar rock
Blue opal gemstones
Citrine crystals
Opal mineral stone
Yellow-green Tourmaline rough
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystal specimen
Tourmaline crystal specimens
Rubellite Tourmaline in Lepidolite Mica
Green Avanturine Quartz gemstone
Opal gemstones
Single piece of blue opal
Quartz mineral stone
Quartz polished stone
Quartz vein
Opal rock
Black opal gemstone
Quartz crystal mineral
Amber citrine quartz stone
Amethyst crystals
Citrine.
Green calcite crystal
Smokey Quartz gemstone
Milky Quartz gemstone
Polarized light experiments, 1847
Quartz monzonite
Quartz boulder
Brecciated quartz
Crackle quartz
Graphic tourmaline, light micrograph
Amethyst gemstones
Specimen of rose quartz from Brazil
Celestite crystals
Opal gem necklace
A specimen of quartz
Quartz crystal from Sentis, Switzerland.
Amethyst crystals, light micrograph
Mylonite, light micrograph
Cut Watermelon Tourmaline gemstone
Granitic pegmatite
Cut green Paraiba Tourmaline gemstone
Quartz encrusted calcite crystals
Opal
Pietersite semi-precious rock
Garnet gemstone
Amethyst geode interior
Rubellite I
Rubellite II
Smoky quartz crystals
Citrine
Fire Opal
Dyed agate slice
Jasper
Agate
Banded texture in agate
Jasper breccia rock
Galenite and quartz crystals
Chabazite crystals in quartz
Orthoclase and quartz crystals
Quartz crystal
Opal specimen
Opal in its host rock
Opal gem and rock
Fire opal
Opal surface
Opal on bedrock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Trillion cut tourmaline gemstone
Herkimer diamonds
Sand
Quartzite rocks
Quartzite rocks covered in lichens
Tiger's eye mineral, light micrgraph