Black tourmaline in mica schist
Schorl tourmaline crystal stone
Schorl and quartz crystals in groundmass
Tourmaline crystals in quartzite
Tourmaline in gneiss rock
Tourmaline schorl specimen
Tourmaline
Watermelon tourmaline
Tourmaline crystals in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Elbaite mineral (tourmaline)
Tourmaline on quartz
Graphic tourmaline, light micrograph
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline embedded in feldspar rock
Tourmaline gemstone
Tourmaline Pegmatite
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Schorl variety of Tourmaline, Namibia
Quartz and green tourmaline crystals
Tourmaline crystal
Tourmaline quartz
Tourmaline in pegmatite host rock
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Verdite green tourmaline gemstone
Tourmaline crystal, thin section
Tourmaline mica in slate
Tourmaline specimen
Bi-coloured tourmaline crystals
Pink tourmaline crystals growing on mica
Opalised fossil
Schorl (black Toutmaline)
Rubellite Tourmaline in Lepidolite Mica
Opal gem necklace
Fire opal
Ironstone matrix with potch opal
Tourmaline gem
Tourmaline pegmatite
Tourmaline cross section
Tourmaline gem, 365 carat
Tourmaline mineral, light micrograph
Granite specimen
Tourmaline unworked stones
Green Tourmaline in Muscovite, Maine
Garnet crystals on schist
Almandine crystals in schist
Native gold
Deformed quartz veins in slate
'Black' opal cabochon specimen
Mineral samples
Opal
Tourmaline crystals
Tourmaline gemstones
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Blue tourmaline crystals
Yellow-green Tourmaline rough
Mylonite, light micrograph
Tourmaline Crystals, Minas Gerais, Brazil
Schorl, the black variety of Tourmaline
Rough pinkish-red Rubellite
Almandine
Crystals of green toumaline and pink lepidolite
Cuprocassiterite in quartz mica schist
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Black tourmaline, SEM
Cut green Paraiba Tourmaline gemstone
Emeralds
Peridotite
Garnet in peridotite
Topaz crystal in albite and microcline
Emerald crystal, close up
Olivine peridot crystal, close up
Heat-treated amethyst
Luxulyanite, thin section, LM
Uncut diamond
Andradite crystals
Amethyst
Citrine
Almandine mineral sample
Olivine mineral sample
Garnets in micaschist, light micrograph
Nephrite crystals
Tremolite crystals
Topaz crystals
Pyrope sand
Blue sapphire stone
Blue Sapphire uncut stone
Jade stone
Amethyst geode
Garnet gemstone
Amethyst filled geode
Clinochlore with garnets
Ruby crystal and gems
Pyrargyrite crystals
Topaz specimens
Grossular crystals in host rock
Rough emeralds
Amethyst geode interior
Spessartine garnet
Crushed diamond, SEM
Grossular dodecahedral crystal
Andradite mineral
Demantoid
Uncut diamonds
Amethyst crystals
Amethyst and chalcedony
Lapis lazuli crystals
Prismatic amethyst crystal
Grossular garnet crystals on rock surface
Wollastonite with kolophonite
Mica in quartz, light micrograph
Opal in its host rock
Boulder opal formation
Opal gem and rock
Opal specimen and cut stone
Opal on bedrock
Potch opal with smooth and rough surface
Cut green Tourmaline gemstone
Green hemimorphite in groundmass
Opal gemstones
Blue opal gemstones
Single piece of blue opal
Andelusite crystals in slate
Axinite
Limburgite
Opal mineral stone
Opal rock
Black opal gemstone
Geode, thin section micrograph
Titanite bearing granite
Fuchsite mineral stone
Quartz filled concretion
Quartz vein in granite
Graphic granite rock