Tourmaline
Tourmaline on quartz
Tourmaline cross section
Tourmaline unworked stones
Rough pinkish-red Rubellite
Cut Watermelon Tourmaline gemstone
Tourmaline crystal, thin section
Schorl tourmaline crystal stone
Tourmaline schorl specimen
Black tourmaline in mica schist
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Schorl and quartz crystals in groundmass
Axinite
Tourmaline in pegmatite host rock
Tourmaline in gneiss rock
Tourmaline crystal specimen
Schorl (black Toutmaline)
Cut green Tourmaline gemstone
Black tourmaline, SEM
Cut Indicolite gemstone
Tourmaline gemstone
Watermelon tourmaline
Tourmaline crystals in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimens
Elbaite mineral (tourmaline)
Tourmaline embedded in feldspar rock
Graphic tourmaline, light micrograph
Concentric banding in agate
Almandine
Rare bright green Uvarovite Garnet
Zircon crystals on host rock
Chrysocolla mineral
Beryl crystals
Rose Quartz
Citrine
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Schorl variety of Tourmaline, Namibia
Quartz and green tourmaline crystals
Pallasite meteorite fragment
Tourmaline crystal
Tourmaline quartz
Tourmaline Pegmatite
Quartz coated with silica
Feldspar and quartz
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Ironstone matrix with potch opal
Prehnite and okenite
Fire Opal
Agate
Chalcedony
Pink beryl crystal, SEM
Ruby in zoisite
Kyanite
Raw garnet crystal
Tourmaline specimen
Malachite and chrysocolla minerals
Gneiss with garnet
Opal
Smoky quartz
Apophyllite on calcite
Verdite green tourmaline gemstone
Zinnwaldite mineral group
Stilbite crystal group
Sample of feldspar
Lizardite in serpentine rock
Quartz crystals, SEM
Quartz crystal, SEM
Apophyllite crystals
Bi-coloured tourmaline crystals
Meyerhofferite mineral
Scolecite
Lapis lazuli, SEM
Emerald
Cut Kyanite gemstone
Cut Pyrope gemstone
Gneiss with garnet, light micrograph
Microcline mineral
Twinned augite crystals
Cut Scapolite round gemstone
Sample of muscovite
Opal gem necklace
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Mineral samples
Hornblende crystals
Pyroxene crystal, thin section
Cut Diopside gemstone
Albite with Tourmaline
Cut Spessartine gemstone
Tourmaline Crystals, Minas Gerais, Brazil
Granite specimen
Mylonite, light micrograph
Aragonite crystals with sulphur
Graphite on calcite crystals
Stibnite
Calcite crystal
Calcite
Quartz encrusted calcite crystals
Amethyst crystals
Calcite crystals
Coral calcite crystals
Brazilianite crystals in calcite
Magnetite and calcite
Aragonite crystals
Flos-ferri aragonite
Pseudomorphic crystal growth
Gypsum stone
Cut and polished septarian nodule
Pink calcite crystals
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Aragonite
Scalenohedral calcite crystals
Cerussite
Nailhead calcite and galena
Magnesite crystals in groundmass
Scalenohedral calcite, close-up
Garnet
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Calcite crystal rosettes
Limburgite
Scapolite mineral sample
A piece of Thenardite
Moss agate
Asbestos veins in serpentinite
Tourmaline gem
Tourmaline crystals
Tourmaline gemstones
Tourmaline pegmatite