Tourmaline
Tourmaline schorl specimen
Opal surface
Tourmaline crystals in quartz
Aurichalcite in limonite groundmass
Pyromorphite in limonite groundmass
Watermelon tourmaline
Tourmaline crystal
Tourmaline quartz
Tourmaline Pegmatite
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
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
Quartz crystal and limonite mineral
Limburgite
Quartz vein in granite
Spheroidal adamite in limonite groundmass
Graphic tourmaline, light micrograph
Verdite green tourmaline gemstone
Tourmaline gemstone
Mylonite, light micrograph
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Schorl and quartz crystals in groundmass
Bi-coloured tourmaline crystals
Muscovite
Tourmaline on quartz
Limonite specimen
Chlorargyrite in limonite groundmass
Tourmaline cross section
Hemimorphite in Limonite hostrock
Tourmaline unworked stones
Tourmaline gem
Tourmaline crystals
Tourmaline specimen
Tourmaline gemstones
Tourmaline pegmatite
Black tourmaline, SEM
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Blue tourmaline crystals
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
Schorl, the black variety of Tourmaline
Pink tourmaline crystals growing on mica
Limonite, Chittenden, Vermont, USA
Limonite, close-up
Schorl (black Toutmaline)
Rough pinkish-red Rubellite
Tourmaline in pegmatite host rock
Opal gem necklace
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Ironstone matrix with potch opal
Mineral samples
Opal
Apatite crystals in quartz
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Granite specimen
Crystals of green toumaline and pink lepidolite
Cut green Paraiba Tourmaline gemstone
Turquoise mineral
Limonite Sand Concretion, New Jersey, USA
Hedyphane
Magnetite in quartz
Apatite crystal
Apatite crystals
Opal gemstones
Blue opal gemstones
Opal specimens
Opal specimen
Single piece of blue opal
Opal mineral stone
Opal rock
Black opal gemstone
Citrine crystals
Ruby
Ruby crystal and gems
Sapphire crystal
Amethyst
Dendritic pyrolusite
Fossil turtle coprolites I
Fossil turtle coprolites II
Vanadinite mineral sample
Lapis lazuli crystals
Cut green Tourmaline gemstone
Rubellite I
Rubellite II
Diamonds
Diamond
Chalcopyrite and quartz crystals
Cuprocassiterite in quartz mica schist
Rubies and sapphire
Limonite, Connecticut, USA
Almandine crystals
Mineral properties, 18th century
Turquoise embedded in iron oxide
Almandine
Polarized light experiments, 1847
Granitic pegmatite
Opal gemstone
Uncut diamond
Raw amethyst crystal
Raw citrine crystal
Raw garnet crystal
Herkimer diamonds of quartz mineral
Andradite, New Jersey
Microdiamond crystal
Citrine
Diamond with garnet inclusion
Cut diamond
Cut and polished diamonds
Andradite crystals
Almandine mineral sample
Olivine mineral sample
Garnets in micaschist, light micrograph
Nephrite crystals
Tremolite crystals
Topaz crystals
Pyrope sand
Blue sapphire stone
Blue Sapphire uncut stone
Jade stone
Amethyst geode
Amethyst geodes
Garnet gemstone
Amethyst filled geode
Clinochlore with garnets