Tourmaline crystal
Raw tourmaline crystal
Tourmaline gemstones and crystal
Schorl tourmaline crystal stone
Tourmaline
Watermelon tourmaline
Tourmaline quartz
Tourmaline Pegmatite
Tourmaline crystals in quartz
Tourmaline in quartz
Tourmaline in gneiss rock
Elbaite mineral (tourmaline)
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Black tourmaline in mica schist
Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Elbaite mineral
Tourmaline gemstone
Dravite mineral
Schorl and quartz crystals in groundmass
Hawk's Eye quartz stone
Tourmaline crystal, thin section
Tourmaline crystal specimen
Tourmaline crystal specimens
Rubellite tourmaline pendant
Tourmaline embedded in feldspar rock
Elbaite crystal, variety Tourmaline
Tourmaline crystals in quartzite
Tourmaline specimen
Tourmaline gem, 365 carat
Blue tourmaline crystals
Tourmaline gemstones in quartz
Quartz and green tourmaline crystals
Pink tourmaline crystals growing on mica
Tourmaline gem
Tourmaline crystals
Tourmaline gemstones
Tourmaline pegmatite
Elbaite on albite and quartz
Graphic tourmaline, light micrograph
Tourmaline crystals in matrix
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline mica in slate
Schorl variety of Tourmaline, Namibia
Crystals of green toumaline and pink lepidolite
Tourmaline mineral, light micrograph
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Fire opal
Ironstone matrix with potch opal
Tourmaline schorl specimen
Opal gem necklace
Schorl, the black variety of Tourmaline
Tourmaline cross section
Tourmaline on quartz
Schorl (black Toutmaline)
Blue opal gemstones
Opalised fossil
Opal mineral stone
Black tourmaline, SEM
Rubellite Tourmaline in Lepidolite Mica
Opal gemstones
Single piece of blue opal
Opal rock
Black opal gemstone
Tourmaline unworked stones
Mineral samples
Tourmaline in pegmatite host rock
Yellow-green Tourmaline rough
Prismatic amethyst crystal
Polarized light experiments, 1847
Olivine peridot crystal, close up
Rough pinkish-red Rubellite
Quartz crystal from Sentis, Switzerland.
'Black' opal cabochon specimen
Opal
Raw amethyst crystal
Raw citrine crystal
Grossular dodecahedral crystal
Deformation of garnet crystal
Emerald crystal, close up
Granite specimen
Mylonite, light micrograph
Cut Watermelon Tourmaline gemstone
Quartz vein
Quartz crystals
Malachite
Topaz crystal in albite and microcline
Granitic pegmatite
Rubellite I
Rubellite II
Opal gemstone
Garnet gemstone
Amethyst geode interior
Amethyst crystals
Aquamarine crystals
Grossular garnet crystals on rock surface
Citrine
Diamonds
Trillion cut tourmaline gemstone
Opal specimen
Cut green Paraiba Tourmaline gemstone
Ruby crystal and gems
Single amethyst crystal, close up
Citrine crystals
Andradite, New Jersey
Andradite crystals
Almandine mineral sample
Olivine mineral sample
Nephrite crystals
Topaz crystals
Pyrope sand
Amethyst filled geode
Topaz specimens
Grossular crystals in host rock
Rough emeralds
Almandine crystals in schist
Spessartine garnet
Andradite mineral
Demantoid
Uncut diamonds
Amethyst crystals, light micrograph
Peridotite
Garnet in peridotite
Sample of sapphire
Diamond
Amethyst and chalcedony
Calcite on amethyst
Lazurite crystals in a matrix of calcite
Mass of prismatic aquamarine crystals
Opal in its host rock
Opal gem and rock
Opal surface
Opal on bedrock
Potch opal with smooth and rough surface
Jade stone
Garnet crystals on schist
Pyrargyrite crystals
Aquamarine crystal
Boulder opal formation
Opal specimen and cut stone
Quartz crystal
Calcite crystal