Opal in its host rock
Opal rock
Opal gemstones
Blue opal gemstones
Opal on bedrock
Single piece of blue opal
Opal mineral stone
Black opal gemstone
Opal gem and rock
Opal
Fire opal
Opal gem necklace
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Boulder opal formation
Opal specimen and cut stone
Opalised fossil
Round polished Common Opal
Opal gemstone
Opal specimen
Opal surface
Opal specimens
Fire Opal
'Black' opal cabochon specimen
Mineral samples
オパール
Fire opal birthstone
Cut Fire Opal gemstone
Three pieces of blue opal
A cut and polished fire opal
Slice through fossilised wood revealing opal
Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Opal birthstone
Black tourmaline in mica schist
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Tourmaline
Tourmaline specimen
Watermelon tourmaline
Elbaite mineral
Dravite mineral
Tourmaline crystals in quartz
Schorl and quartz crystals in groundmass
Elbaite mineral (tourmaline)
Tourmaline gemstone
Grossular crystals in host rock
Tourmaline in gneiss rock
Tourmaline crystals in quartzite
Asscher cut diamond gemstone
Pink diamonds
Tourmaline embedded in feldspar rock
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Tourmaline gem, 365 carat
Tourmaline gem
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Tourmaline mica in slate
Tourmaline crystal
Blue tourmaline crystals
Pink tourmaline crystals growing on mica
Quartz and green tourmaline crystals
Crystals of green toumaline and pink lepidolite
Tourmaline gemstones
Tourmaline quartz
Tourmaline pegmatite
Tourmaline Pegmatite
Limburgite
蛋白石
Quartz boulder
Brecciated quartz
Nephrite crystals
Moonstone gemstones
Lapis lazuli
Jade sword handle
Rough emeralds
Turquoise mineral
Pyrargyrite crystals
Granite specimen
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Elbaite on albite and quartz
Mylonite, light micrograph
Metamorphic rock
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Tourmaline mineral, light micrograph
Garnet-bearing rock
Jasper breccia rock
Grossular garnet crystals on rock surface
Turquoise on rock surface, close-up
Tremolite crystals
Opal Bivalve fossil Coober Pedy Australia
Diamond in host rock
Rough emerald
Granitic pegmatite
Rough diamond
Conglomerate rock
Silica rock crystal samples
Agate mineral rock cross section
Graphic tourmaline, light micrograph
Sample of Labradorite
Andradite crystals
Citrine
Peridot
Almandine mineral sample
Olivine mineral sample
Agate in amethyst
Topaz crystals
Pyrope sand
Jade stone
Garnet gemstone
Amethyst filled geode
Garnet crystals on schist
Mineral exploration drilling, Kenya
Diamond drill bit
Mining core samples, Kenya