Elbaite mineral (tourmaline)
Indicolite tourmaline faceted stone
Elbaite mineral
Tourmaline quartz
Tourmaline in quartz
Tourmaline
Elbaite on albite and quartz
Watermelon tourmaline
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Tourmaline crystals in quartz
Elbaite crystal, variety Tourmaline
Black tourmaline in mica schist
Dravite mineral
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline embedded in feldspar rock
Tourmaline gemstone
Hawk's Eye quartz stone
Schorl and quartz crystals in groundmass
Tourmaline crystal
Tourmaline Pegmatite
Tourmaline in gneiss rock
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline in pegmatite host rock
Verdite green tourmaline gemstone
Graphic tourmaline, light micrograph
Bi-coloured tourmaline crystals
Tourmaline specimen
Tourmaline crystal, thin section
Tourmaline schorl specimen
Tourmaline crystals
Mineral samples
Opal gem necklace
Fire opal
Ironstone matrix with potch opal
Tourmaline unworked stones
Tourmaline gem
Tourmaline gemstones
Tourmaline pegmatite
Rubellite I
Rubellite II
Tourmaline mineral, light micrograph
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Tourmaline mica in slate
Blue tourmaline crystals
Schorl variety of Tourmaline, Namibia
Quartz and green tourmaline crystals
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Pink tourmaline crystals growing on mica
Tourmaline on quartz
Opalised fossil
Tourmaline cross section
Yellow-green Tourmaline rough
Schorl, the black variety of Tourmaline
'Black' opal cabochon specimen
Opal
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Crystals of green toumaline and pink lepidolite
Cut Indicolite gemstone
Granite specimen
Mylonite, light micrograph
Cut green Paraiba Tourmaline gemstone
Andradite mineral
Rough pinkish-red Rubellite
Almandine mineral sample
Olivine mineral sample
Black tourmaline, SEM
Rubellite Tourmaline in Lepidolite Mica
Opal mineral stone
Emerald crystal, close up
Olivine peridot crystal, close up
Nephrite crystals
Rough emeralds
Grossular dodecahedral crystal
Schorl (black Toutmaline)
Andradite crystals
Citrine
Topaz crystals
Pyrope sand
Jade stone
Garnet gemstone
Amethyst filled geode
Garnet crystals on schist
Topaz specimens
Grossular crystals in host rock
Almandine crystals in schist
Pyrargyrite crystals
Amethyst geode interior
Spessartine garnet
Demantoid
Uncut diamonds
Peridotite
Garnet in peridotite
Amethyst and chalcedony
Topaz crystal in albite and microcline
Prismatic amethyst crystal
Grossular garnet crystals on rock surface
Opal gemstones
Blue opal gemstones
Single piece of blue opal
Agate mineral rock cross section
Emeralds
Opal rock
Black opal gemstone
Round polished Common Opal
Amethyst
Opal in its host rock
Opal gem and rock
Opal on bedrock
Potch opal with smooth and rough surface
Cut green Tourmaline gemstone
Siderite mineral
Prasiolite mineral
Rose quartz mineral, artwork
Uncut diamond
Garnets in micaschist, light micrograph
Tremolite crystals
Blue sapphire stone
Blue Sapphire uncut stone
Amethyst geode
Clinochlore with garnets
Ruby crystal and gems
Crushed diamond, SEM
Amethyst crystals
Lapis lazuli crystals
Heat-treated amethyst
Mineral properties, 18th century
Ruby
Sapphire crystal
Boulder opal formation
Opal specimen and cut stone
Titanite crystals in actinolite
Raw aquamarine crystal
Azurite crystals