Schorl tourmaline crystal stone
Schorl and quartz crystals in groundmass
Hawk's Eye quartz stone
Black tourmaline in mica schist
Tourmaline schorl specimen
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Tourmaline crystals in quartz
Tourmaline gemstone
Tourmaline in gneiss rock
Quartz and green tourmaline crystals
Tourmaline
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline gemstones in quartz
Tourmaline on quartz
Opal gem necklace
Watermelon tourmaline
Schorl variety of Tourmaline, Namibia
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Elbaite mineral (tourmaline)
Tourmaline in pegmatite host rock
Tourmaline embedded in feldspar rock
Elbaite on albite and quartz
Amethyst
Amethyst geode
Amethyst geodes
Citrine
Graphic tourmaline, light micrograph
Tourmaline quartz
Tourmaline crystal
Tourmaline in quartz
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
Garnet crystal and rock
Elbaite mineral
Dravite mineral
Granite specimen
Tourmaline Pegmatite
Egyptian jasper stone
Botswana agate stones
Round agate geode
Round agate thunderegg
Two agate thundereggs
Turritella agate
Agate slice
Blue lace agate
Botswana agate stone
Carnelian gemstone
Fuchsite mineral stone
Yellow Jasper
Leopardskin jasper stone
Quartz
Quartz polished stone
Tiger Eye quartz gemstone
Avanturine smooth gemstone
Quartz filled concretion
Schorl (black Toutmaline)
Blue sapphire stone
Blue Sapphire uncut stone
Jade stone
Spotted Jasper stone
Verdite green tourmaline gemstone
Rutilated quartz
Tourmaline specimen
Quartz crystal
Bi-coloured tourmaline crystals
Ruby
Garnet crystals on schist
Pyrargyrite crystals
Tourmaline cross section
Tourmaline unworked stones
Schorl, the black variety of Tourmaline
Opal
Garnet gemstone
Amethyst filled geode
Amethyst crystals
Amethyst geode interior
Amethyst and chalcedony
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Ironstone matrix with potch opal
Mineral samples
Quartz crystals
Elbaite crystal, variety Tourmaline
Yellow-green Tourmaline rough
Mylonite, light micrograph
Opal mineral stone
Opal rock
Black opal gemstone
Rough pinkish-red Rubellite
Calcite crystal
Kyanite crystal
Luxulyanite, thin section, LM
Quartz types
Pseudomorphic crystal growth
Emerald crystal in quartz
Silica rock crystal samples
Zeolite crystal
Tourmaline gem
Tourmaline crystals
Tourmaline gemstones
Tourmaline pegmatite
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Prismatic amethyst crystal
Citrine gemstones and crystal
Black tourmaline, SEM
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Blue tourmaline crystals
Cut green Paraiba Tourmaline gemstone
Cut and polished jasper
Jasper
Tourmaline Crystals, Minas Gerais, Brazil
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Pink tourmaline crystals growing on mica
Quartz crystal from Sentis, Switzerland.
Raw citrine crystal
Aventurine gemstone
Iron oxide precipitation in agate
Smoky quartz crystals
Rose quartz mineral, artwork
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
Cabuchon gemstones of jasper
Dyed agate slice
Moss Agate stone
Amethyst stone
Banded Amethyst stone
Aragonite crystals
Beryl stone
Calcite
Chalcopyrite
Chiastolite stone
Jasper polished stone