Granitic pegmatite
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline gemstone
Verdite green tourmaline gemstone
Rubellite I
Rubellite II
Pink tourmaline crystals growing on mica
Crystals of green toumaline and pink lepidolite
Green Tourmaline in Muscovite, Maine
Bi-coloured tourmaline crystals
Tourmaline gem
Black tourmaline in mica schist
Tourmaline mica in slate
Schorl and quartz crystals in groundmass
Luxulyanite, thin section, LM
Tourmaline gem, 365 carat
Tourmaline mineral, light micrograph
Rubellite Tourmaline in Lepidolite Mica
Granite specimen
Tourmaline crystals in quartz
Tourmaline in quartz
Tourmaline crystals in matrix
Tourmaline
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Albite with Tourmaline
Tourmaline crystals on Albite
Watermelon tourmaline
Dravite mineral
Tourmaline in gneiss rock
Tourmaline gemstones
Tourmaline quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Tourmaline crystals in quartzite
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline specimen
Elbaite mineral
Polarized light experiments, 1847
Tourmaline crystal
Blue tourmaline crystals
Quartz and green tourmaline crystals
Elbaite mineral (tourmaline)
Tourmaline gemstones in quartz
Graphic tourmaline, light micrograph
Tourmaline Crystals, Minas Gerais, Brazil
Opal gemstones
Single piece of blue opal
Opal rock
Black opal gemstone
Schorl, the black variety of Tourmaline
Blue opal gemstones
紅電気石
電気石
Lazurite crystals in a matrix of calcite
Sapphire gravel recovered from a stream
オパール
Opal mineral stone
Elbaite on albite and quartz
Opalised fossil
Opal in its host rock
Opal on bedrock
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystal specimen
Tourmaline crystal specimens
Yellow-green Tourmaline rough
Mylonite, light micrograph
Slice through fossilised wood revealing opal
ベージュの布上に置かれた花をモチーフにしたブローチ
Schorl (black Toutmaline)
Opal gemstone
Rubellite tourmaline pendant
Tourmaline embedded in feldspar rock
Cyanotrichite crystal
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Tourmaline in pegmatite host rock
Opal gem and rock
Fire opal
Opal surface
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Opal gem necklace
Triangular step cut Brazilianite
A cut and polished fire opal
Cut Watermelon Tourmaline gemstone
Fire opal birthstone
Opal
Round polished Common Opal
Pyrite bead necklace
Opal specimen
Opal specimens
Fire Opal
Three pieces of blue opal
Peridotite
Garnet in peridotite
Moonstones
Rough emerald
Turquoise stones
Opal birthstone
Citrine crystals
Tourmaline schorl specimen
Tourmaline on quartz
Obsidian mineral stone
Cut green Tourmaline gemstone
Boulder opal formation
Opal specimen and cut stone
Marcasite bracelet
Hiddenite crystal
Turquoise stone
Garnet
Aquamarine crystals
Emeralds
蛋白石
Mineral properties, 18th century
Moonstone gemstones
Alexandrite stone
Amethyst crystals
石板にシルクを三角に折りアクセサリーを配置
Rough pinkish-red Rubellite
Tourmaline cross section
Tuff rock with graded bedding
Garnet.
Citrine.
Tarquoise.
Polished turquoise stone
Topaz gemstones
Turquoise gemstones
Garnet gemstones
Orthoclase adenoma moonstone gemstone
Uncut emeralds
Moonstone.
Aquamarine gems
Two-mica granite
Mineral samples
Uncut diamond from Africa
Aquamarine crystal
Asscher cut diamond gemstone
Pink diamonds
Biotite in calcite groundmass
Cassiterite on muscovite groundmass
Sapphire gemstone
'Black' opal cabochon specimen
Cut Fire Opal gemstone