Tourmaline on quartz
Tourmaline
Tourmaline unworked stones
Tourmaline cross section
Axinite
Black tourmaline in mica schist
Schorl and quartz crystals in groundmass
Tourmaline crystal, thin section
Tourmaline in pegmatite host rock
Zircon crystals on host rock
Schorl tourmaline crystal stone
Tourmaline schorl specimen
Rough pinkish-red Rubellite
Almandine
Pallasite meteorite fragment
Tourmaline in gneiss rock
Graphic tourmaline, light micrograph
Quartz coated with silica
Concentric banding in agate
Tourmaline crystals in quartz
Chrysocolla mineral
Beryl crystals
Schorl (black Toutmaline)
Citrine
Rose Quartz
Cut green Tourmaline gemstone
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Microcline mineral
Cut green Paraiba Tourmaline gemstone
Rare bright green Uvarovite Garnet
Pyroxene crystal, thin section
Smoky quartz
Black tourmaline, SEM
Agate
Chalcedony
Prehnite and okenite
Tourmaline crystals in quartzite
Quartz crystals, SEM
Malachite and chrysocolla minerals
Tourmaline Pegmatite
Sample of muscovite
Ruby in zoisite
Indicolite tourmaline faceted stone
Feldspar and quartz
Kyanite
Elbaite on albite and quartz
Gneiss with garnet
Brazilianite crystals in calcite
Cut and polished septarian nodule
Raw garnet crystal
Watermelon tourmaline
Lapis lazuli crystals I
Lapis lazuli crystals II
Quartz crystal, SEM
Pink beryl crystal, SEM
Zinnwaldite mineral group
Watermelon tourmaline crystalline stone
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Elbaite mineral (tourmaline)
Quartz and green tourmaline crystals
Rutilated quartz
Apophyllite crystals
Tourmaline embedded in feldspar rock
Lizardite in serpentine rock
Stilbite crystal group
Asbestos veins in serpentinite
Tourmaline quartz
Hawk's Eye quartz stone
Tourmaline in quartz
Apophyllite on calcite
Gneiss with garnet, light micrograph
Cut Indicolite gemstone
Amethyst crystals
Quartz encrusted calcite crystals
Twinned augite crystals
Hornblende crystals
Sample of feldspar
Blue labradorite
Quartz vein in granite
Uvarovite crystals
Schorl variety of Tourmaline, Namibia
Celestine crystals in sulphur groundmass
Tourmaline gemstone
Quartz mineral stone, light micrograph
Magnesite crystals in groundmass
Elbaite mineral
Dravite mineral
Lapis lazuli, SEM
Emerald
Cut pink topaz gemstone
Tourmaline crystal
Pyrolusite in quartz
Fayalite
Cut Spessartine gemstone
Raw tourmaline crystal
Tourmaline gemstones and crystal
Chalcanthite crystals in rock groundmass
Citrine crystal group
Sylvanite crystals
Rhodonite
Labradorite
Aragonite crystals with sulphur
Graphite on calcite crystals
Tetrahedrite
Stibnite
Meyerhofferite mineral
Sapphire crystal
Calcite crystal
Calcite
Cut Kyanite gemstone
Cut Scapolite round gemstone
Calcite crystals
Coral calcite crystals
Magnetite and calcite
Aragonite crystals
Flos-ferri aragonite
Pseudomorphic crystal growth
Gypsum stone
Pink calcite crystals
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Aragonite
Scalenohedral calcite crystals
Cerussite
Scalenohedral calcite, close-up
Molybdenite in granite groundmass
Scolecite
Chabazite
Fire Opal
Titanite bearing granite
Fuchsite mineral stone
Emeralds
Graphic granite rock
Granite
Peridotite
Garnet in peridotite
Calcite crystal rosettes
Basalt, light micrograph