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