Mineral properties, 18th century
Elbaite mineral
Dravite mineral
Tourmaline crystals in quartzite
Elbaite mineral (tourmaline)
Verdite green tourmaline gemstone
Tourmaline gemstone
Bi-coloured tourmaline crystals
Elbaite on albite and quartz
Schorl and quartz crystals in groundmass
Tourmaline embedded in feldspar rock
Mylonite, light micrograph
Graphic tourmaline, light micrograph
Tourmaline
Black tourmaline in mica schist
Tourmaline crystals in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Granite specimen
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline schorl specimen
Tourmaline specimen
Watermelon tourmaline
Tourmaline mineral, light micrograph
Tourmaline unworked stones
Mineral samples
Electrochemical sensor production
Cut Watermelon Tourmaline gemstone
Rough pinkish-red Rubellite
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Tourmaline on quartz
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline Pegmatite
Tourmaline in quartz
Tourmaline gem, 365 carat
Tourmaline gem
Tourmaline crystals in matrix
Schorl, the black variety of Tourmaline
Tourmaline Crystals, Minas Gerais, Brazil
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline quartz
Tourmaline pegmatite
Tourmaline gemstones in quartz
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline mica in slate
Tourmaline crystal
Tourmaline in gneiss rock
Blue tourmaline crystals
Pink tourmaline crystals growing on mica
Quartz and green tourmaline crystals
Crystals of green toumaline and pink lepidolite
Tourmaline gemstones
Opalised fossil
Opal in its host rock
Opal on bedrock
Cut green Tourmaline gemstone
Tourmaline cross section
Synthetic diamond film production
Synthetic diamond film
Opal mineral stone
Polarized light experiments, 1847
Thomas Thomson
Tourmaline in pegmatite host rock
Granitic pegmatite
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Opal
Opal gem necklace
Boulder opal formation
Opal gem and rock
Opal specimen and cut stone
Fire opal
'Black' opal cabochon specimen
Opal gemstones
Opal specimens
Opal specimen
Single piece of blue opal
Opal rock
Black opal gemstone
Blue opal gemstones
Cut Indicolite gemstone
Artificial retinas
Quartz boulder
Brecciated quartz
Rubellite I
Rubellite II
Limburgite
Turquoise mineral
Agate mineral rock cross section
Manufacture of artificial retinas
Red sandstone
Red and white sandstone
Martian soil sample, X-ray diffraction analysis
Round polished Common Opal
Cut Fire Opal gemstone
Opal gemstone
Cullinan Diamond
Diamond theft reward poster, April 1965
Illustrations of Indian diamonds
Venetia Diamond Mine, South Africa
Diamond miners with explosives
Diamond miners, South Africa
Diamond processing, Siberia, Russia
Paul Schofield, British mineralogist
電気石
紅電気石
Fire Opal
Opal surface
Atom probe analysis, SEM
Asscher cut diamond gemstone
Pink diamonds
Jasper
Tiger eye
Quartz monzonite
Herkimer diamonds
Jasper breccia rock
Agate objects
First laser
Siderite mineral
Prasiolite mineral
Andradite mineral