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