Tourmaline crystals in quartzite
Black tourmaline in mica schist
Tourmaline crystals in quartz
Tourmaline
Schorl and quartz crystals in groundmass
Watermelon tourmaline
Graphic tourmaline, light micrograph
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Elbaite mineral (tourmaline)
Tourmaline gemstone
Tourmaline embedded in feldspar rock
Native gold
Elbaite on albite and quartz
Tourmaline Pegmatite
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Tourmaline crystal
Tourmaline quartz
Tourmaline schorl specimen
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
Tourmaline in quartz
Tourmaline in gneiss rock
Bi-coloured tourmaline crystals
Quartzite rocks
Opalised fossil
Verdite green tourmaline gemstone
Quartzite rocks covered in lichens
Tourmaline on quartz
Tourmaline cross section
Tourmaline unworked stones
Tourmaline specimen
Pink tourmaline crystals growing on mica
Quartzite specimen
Quartzite mineral, light micrograph
Tourmaline crystals
Granite specimen
Tourmaline gem
Tourmaline pegmatite
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Blue tourmaline crystals
Tourmaline gem, 365 carat
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Rough pinkish-red Rubellite
Tourmaline Crystals, Minas Gerais, Brazil
Quartz and green tourmaline crystals
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Tourmaline in pegmatite host rock
Opal gem necklace
Fire opal
'Black' opal cabochon specimen
Ironstone matrix with potch opal
Mineral samples
Opal
Crystals of green toumaline and pink lepidolite
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Mylonite, light micrograph
Cut green Paraiba Tourmaline gemstone
Tourmaline gemstones
Almandine
Black tourmaline, SEM
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline gemstones in quartz
Schorl variety of Tourmaline, Namibia
Deformed quartz veins in slate
Schorl, the black variety of Tourmaline
Ruby quartz
Nephrite crystals
Tremolite crystals
Pyrargyrite crystals
Lapis lazuli crystals
Grossular crystals in host rock
Wollastonite with kolophonite
Garnet crystals on schist
Almandine crystals in schist
Mineral properties, 18th century
Quartz vein in schist
Microfolds in graphite schist, LM
Diamond in host rock
Cut green Tourmaline gemstone
Microdiamond crystal
Rough emeralds
Crushed diamond, SEM
Andelusite crystals in slate
Andradite crystals
Topaz crystals
Amethyst crystals
Uvarovite garnet crystals
Lazurite crystals in a matrix of calcite
Emeralds
Peridotite
Garnet in peridotite
Topaz crystal in albite and microcline
Emerald crystal, close up
Olivine peridot crystal, close up
Heat-treated amethyst
Grossular garnet crystals on rock surface
Opal in its host rock
Opal on bedrock
Limburgite
Granitic pegmatite
Schorl (black Toutmaline)
Sapphire crystals in rock groundmass
Colourful crystals
Titanite crystals in actinolite
Galenite and quartz crystals
Chabazite crystals in quartz
Quartz encrusted calcite crystals
Orthoclase and quartz crystals
Crystals of haematite in quartz
Ruby
Axinite
Citrine Crystal Gemstone
Uncut diamond
Amethyst
Citrine
Cut diamond
Almandine mineral sample
Olivine mineral sample
Garnets in micaschist, light micrograph
Pyrope sand
Blue sapphire stone
Blue Sapphire uncut stone
Jade stone
Amethyst geode
Amethyst geodes
Garnet gemstone
Amethyst filled geode
Clinochlore with garnets
Ruby crystal and gems
Orange sapphire gemstone
Sapphire crystal
Topaz gemstone
Topaz specimens