Tourmaline on quartz
Tourmaline
Tourmaline cross section
Tourmaline unworked stones
Rough pinkish-red Rubellite
Tourmaline crystal, thin section
Schorl tourmaline crystal stone
Tourmaline schorl specimen
Black tourmaline in mica schist
Schorl and quartz crystals in groundmass
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Tourmaline in gneiss rock
Schorl (black Toutmaline)
Axinite
Tourmaline crystals in quartz
Cut green Tourmaline gemstone
Tourmaline in pegmatite host rock
Black tourmaline, SEM
Tourmaline gemstone
Watermelon tourmaline
Rose Quartz
Elbaite mineral (tourmaline)
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline embedded in feldspar rock
Elbaite on albite and quartz
Hawk's Eye quartz stone
Cut Indicolite gemstone
Quartz and green tourmaline crystals
Tourmaline quartz
Graphic tourmaline, light micrograph
Rare bright green Uvarovite Garnet
Concentric banding in agate
Almandine
Zircon crystals on host rock
Tourmaline in quartz
Citrine
Elbaite mineral
Dravite mineral
Schorl variety of Tourmaline, Namibia
Tourmaline Pegmatite
Tourmaline crystal
Quartz coated with silica
Feldspar and quartz
Smoky quartz
Chrysocolla mineral
Beryl crystals
Raw tourmaline crystal
Tourmaline gemstones and crystal
Ironstone matrix with potch opal
Prehnite and okenite
Fire Opal
Ruby in zoisite
Pallasite meteorite fragment
Tourmaline specimen
Raw garnet crystal
Verdite green tourmaline gemstone
Gneiss with garnet
Opal
Quartz encrusted calcite crystals
Agate
Chalcedony
Bi-coloured tourmaline crystals
Quartz crystals, SEM
Quartz crystal, SEM
Pink beryl crystal, SEM
Kyanite
Cut Quartz gemstone
Cut Kyanite gemstone
Cut Pyrope gemstone
Lapis lazuli, SEM
Emerald
Gneiss with garnet, light micrograph
Twinned augite crystals
Cut Scapolite round gemstone
Mineral samples
Opal gem necklace
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Rutilated quartz
Tourmaline gemstones in quartz
Pyrolusite in quartz
Malachite and chrysocolla minerals
Cut Diopside gemstone
Apophyllite on calcite
Zinnwaldite mineral group
Mylonite, light micrograph
Granite specimen
Stilbite crystal group
Calcite crystal
Calcite
Amethyst crystals
Lizardite in serpentine rock
Sample of feldspar
Garnet
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Apophyllite crystals
Limburgite
Chalcopyrite and quartz crystals
Meyerhofferite mineral
Tourmaline gem
Tourmaline crystals
Tourmaline gemstones
Tourmaline pegmatite
Scolecite
Cut yellow Vesuvianite gemstone
Round cut red Andesine
Cut Zircon gemstone
Microcline mineral
Sylvanite crystals
Sample of muscovite
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Blue tourmaline crystals
Lapis lazuli crystals I
Lapis lazuli crystals II
Sapphire crystal
Hornblende crystals
Pyroxene crystal, thin section
Mineral properties, 18th century
Tourmaline Crystals, Minas Gerais, Brazil
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Schorl, the black variety of Tourmaline
Pink tourmaline crystals growing on mica
Quartz
Luxulyanite, thin section, LM
Cut pink Topaz gemstone