Black tourmaline, SEM
Tourmaline crystal, thin section
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Tourmaline unworked stones
Tourmaline
Tourmaline on quartz
Tourmaline cross section
Cut green Tourmaline gemstone
Tourmaline mineral, light micrograph
Lapis lazuli, SEM
Tourmaline mica in slate
Gneiss with garnet, light micrograph
Rough pinkish-red Rubellite
Mylonite, light micrograph
Verdite green tourmaline gemstone
Fire Opal
Bi-coloured tourmaline crystals
Tourmaline gemstone
Tourmaline crystals
Tourmaline specimen
Cut Indicolite gemstone
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline crystals in quartz
Elbaite mineral (tourmaline)
Tourmaline Crystals, Minas Gerais, Brazil
Schorl variety of Tourmaline, Namibia
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Tourmaline embedded in feldspar rock
Schorl, the black variety of Tourmaline
Tourmaline gem
Watermelon tourmaline
Tourmaline crystal
Tourmaline gemstones
Tourmaline quartz
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline in quartz
Tourmaline gem, 365 carat
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline in gneiss rock
Blue tourmaline crystals
Black tourmaline in mica schist
Quartz and green tourmaline crystals
Pink tourmaline crystals growing on mica
Yellow crystal
Raw garnet crystal
Emerald
Elbaite on albite and quartz
Graphic tourmaline, light micrograph
Gneiss with garnet
Uncut emeralds
Hawk's Eye quartz stone
Granite specimen
Elbaite mineral
Dravite mineral
Crystals of green toumaline and pink lepidolite
Schorl and quartz crystals in groundmass
Tourmaline schorl specimen
Amethyst, SEM
Microdiamond crystal
Cut Pyrope gemstone
Rare bright green Uvarovite Garnet
Almandine
Pink beryl crystal, SEM
Opal specimens
Opal specimen
Twinned augite crystals
Citrine
Biotite mineral in orthopyroxene
Aventurine
Garnet
Microdiamond crystal, SEM
Concentric banding in agate
Prehnite and okenite
Lapis lazuli crystals I
Lapis lazuli crystals II
Opal gemstones
Blue opal gemstones
Single piece of blue opal
Opal mineral stone
Opal rock
Black opal gemstone
Ruby crystals, SEM
Quartz crystals, SEM
Quartz crystal, SEM
blue apatite
Rubellite I
Rubellite II
Cut pink Topaz gemstone
Cut Kyanite gemstone
Carnelian
Sand, SEM
Cut pink topaz gemstone
Ironstone matrix with potch opal
Fluorapatite crystal, SEM
電気石
紅電気石
Emerald, SEM
Amethyst crystals
Zircon crystals on host rock
Smoky quartz
Sapphire, SEM
Ruby in zoisite
Kimberlite rock, light micrograph
Garnet mica schist thin cut, polarised light micrograph
Gneiss, thin section, polarised LM
Kelephytic corona, light micrograph
Lherzolite rock, light micrograph
Eclogite rock, light micrograph
Pyroxenite rock, light micrograph
Dunite rock, light micrograph
Olivine flakes, light micrograph
Peridotite rock, light micrograph
Garnets in micaschist, light micrograph
Snowball garnet, light micrograph
Amphibolite, light micrograph
Opal
Mineral properties, 18th century
Polarized light experiments, 1847
Granitic pegmatite
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Tiger eye, thin section micrograph
Tiger eye, light micrograph