Tourmaline schorl specimen
Tourmaline
Schorl tourmaline crystal stone
Schorl and quartz crystals in groundmass
Black tourmaline in mica schist
Tourmaline on quartz
Limburgite
Tourmaline in gneiss rock
Tourmaline in pegmatite host rock
Tourmaline crystal specimen
Schorl (black Toutmaline)
Watermelon tourmaline
Opal surface
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
Schorl variety of Tourmaline, Namibia
Aurichalcite in limonite groundmass
Pyromorphite in limonite groundmass
Tourmaline unworked stones
Graphic tourmaline, light micrograph
Tourmaline gemstone
Quartz crystal and limonite mineral
Mylonite, light micrograph
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Quartz and green tourmaline crystals
Spheroidal adamite in limonite groundmass
Tourmaline crystal
Tourmaline quartz
Tourmaline Pegmatite
Tourmaline specimen
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
Tourmaline in quartz
Tourmaline cross section
Rough pinkish-red Rubellite
Limonite specimen
Quartz vein in granite
Muscovite
'Black' opal cabochon specimen
Verdite green tourmaline gemstone
Granite specimen
Hedyphane
Bi-coloured tourmaline crystals
Magnetite in quartz
Dendritic pyrolusite
Chlorargyrite in limonite groundmass
Schorl, the black variety of Tourmaline
Apatite crystal
Apatite crystals
Opal gem necklace
Fire opal
Opalised fossil
Ironstone matrix with potch opal
Mineral samples
Opal
Apatite crystals in quartz
Almandine crystals
Vanadinite mineral sample
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Limonite, close-up
Cut green Paraiba Tourmaline gemstone
Chalcopyrite and quartz crystals
Cuprocassiterite in quartz mica schist
Tourmaline gem
Tourmaline crystals
Tourmaline gemstones
Tourmaline pegmatite
Black tourmaline, SEM
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Blue tourmaline crystals
Luxulyanite, thin section, LM
Tourmaline Crystals, Minas Gerais, Brazil
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Cut green Tourmaline gemstone
Mineral properties, 18th century
Pink tourmaline crystals growing on mica
Tetrahedrite mineral specimen
Tabular muscovite crystals and apatite
Brown monticellite
Ruby
Ruby crystal and gems
Sapphire crystal
Quartz crystals
Amethyst
Magnetite and calcite
Lapis lazuli crystals
Hemimorphite in Limonite hostrock
Tetrahedrite
Almandine
Opal specimen and cut stone
Vanadinite crystals
Limonite, Chittenden, Vermont, USA
Crystals of green toumaline and pink lepidolite
Uvarovite crystals
Grossular
Orange crystal
Uncut diamond
Cordierite crystal
Spinel crystal
Raw aquamarine crystal
Concentric banding in agate
Geode, thin section micrograph
Microdiamond crystal
Azurite crystals
Citrine
Quartz
Mica in quartz, light micrograph
Native gold
Cut diamond
Iron oxide precipitation in agate
Crystals of haematite in quartz
Smoky quartz crystals
Andradite crystals
Siderite mineral
Almandine mineral sample
Olivine mineral sample
Garnets in micaschist, light micrograph
Nephrite crystals
Tremolite crystals
Titanite bearing granite
Pseudomorphic crystal growth
Titanite crystals in actinolite
Quartz in sphalerite
Molybdenite in quartz monzonite
Galenite and quartz crystals
Rose quartz mineral, artwork
Colourful crystals
Prasiolite mineral