Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline unworked stones
Tourmaline
Tourmaline cross section
Tourmaline mineral, light micrograph
Tourmaline on quartz
Tourmaline mica in slate
Rough pinkish-red Rubellite
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Gneiss with garnet, light micrograph
Cut green Tourmaline gemstone
Mylonite, light micrograph
Watermelon tourmaline
Tourmaline crystal
Tourmaline quartz
Tourmaline Pegmatite
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystals in quartz
Tourmaline in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline in gneiss rock
Elbaite mineral (tourmaline)
Black tourmaline in mica schist
Tourmaline embedded in feldspar rock
Garnets in micaschist, light micrograph
Graphic tourmaline, light micrograph
Raw garnet crystal
Almandine
Verdite green tourmaline gemstone
Tourmaline gemstone
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Schorl and quartz crystals in groundmass
Fire Opal
Tourmaline schorl specimen
Bi-coloured tourmaline crystals
Peridotite rock, light micrograph
Crenulation cleavage in calcite
Citrine
Mica in quartz, light micrograph
Rare bright green Uvarovite Garnet
Lapis lazuli, SEM
Biotite mineral in orthopyroxene
Concentric banding in agate
Lapis lazuli crystals I
Lapis lazuli crystals II
Twinned augite crystals
Komatitite rock, light micrograph
Polarised LM of thin section of gabbro
Tourmaline gem
Tourmaline crystals
Tourmaline specimen
Tourmaline gemstones
Tourmaline pegmatite
Ironstone matrix with potch opal
Prehnite and okenite
Amethyst crystals
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Blue tourmaline crystals
Prehnite mineral
Cut Indicolite gemstone
Tourmaline Crystals, Minas Gerais, Brazil
Schorl variety of Tourmaline, Namibia
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Quartz and green tourmaline crystals
Microdiamond crystal
Ruby in zoisite
Zircon crystals on host rock
Smoky quartz
Tourmaline in pegmatite host rock
Schorl, the black variety of Tourmaline
Pink tourmaline crystals growing on mica
Kimberlite rock, light micrograph
Garnet mica schist thin cut, polarised light micrograph
Kelephytic corona, light micrograph
Lherzolite rock, light micrograph
Eclogite rock, light micrograph
Pyroxenite rock, light micrograph
Dunite rock, light micrograph
Olivine flakes, light micrograph
Schorl (black Toutmaline)
Yellow crystal
Emerald
Gneiss with garnet
Uncut emeralds
Opal gem necklace
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Mineral samples
Opal
Pallasite meteorite fragment
Ammonite fossil, thin section
Mica schist folds, light micrograph
Chemical crystals, polarised LM
Staurolite phenocrysts, polarised light micrograph
Quartz nodule, polarised light micrograph
Ruby crystals, SEM
Pink beryl crystal, SEM
Gabbro rock, light micrograph
Agate. polarised light micrograph
Quartz crystals, SEM
Quartz crystal, SEM
Granite specimen
Crystals of green toumaline and pink lepidolite
Malachite and chrysocolla minerals
Axinite
Chrysocolla mineral
Beryl crystals
Quartz coated with silica
Rose Quartz
Hornblende crystals
Apophyllite crystals
Deformed calcite crystal
Agate
Chalcedony
Quartzite mineral, light micrograph
Granodiorite rock, light micrograph
Melaphyr rock, light micrograph
Peridotite rock
Olivine inclusion in basalt
Gabbro rock
Rock mineral crystals, polarised LM
Pyroxenite mineral, light micrograph
Hornfels, polarised light micrograph
Garnet
Cut Pyrope gemstone
Basalt, light micrograph