Pyroxene crystal, thin section
Twinned augite crystals
Microcline mineral
Axinite
Enstatite
Hornblende crystals
Malachite and chrysocolla minerals
Tourmaline crystal, thin section
Zircon crystals on host rock
Raw garnet crystal
Pallasite meteorite fragment
Tourmaline on quartz
Concentric banding in agate
Chrysocolla mineral
Beryl crystals
Citrine
Smoky quartz
Amethyst crystals
Tourmaline cross section
Quartz crystal, SEM
Pyroxenite mineral, light micrograph
Quartz coated with silica
Lizardite in serpentine rock
Kyanite
Asbestos veins in serpentinite
Leucite basanite, thin section
Sample of muscovite
Andesite
Feldspar and quartz
Almandine
Rare bright green Uvarovite Garnet
Pink beryl crystal, SEM
Rose Quartz
Quartz crystals, SEM
Sample of feldspar
Brazilianite crystals in calcite
Cut and polished septarian nodule
Apophyllite crystals
Tourmaline
Tourmaline unworked stones
Neptunite
Scolecite
Zinnwaldite mineral group
Ruby in zoisite
Stilbite crystal group
Rhodonite
Cross-section slice of Brazilian agate
Chabazite
Kernite crystal
Gneiss with garnet
Apophyllite on calcite
Kunzite crystal and cut stone
Pink anorthite crystals associated with augite
Zoned pyroxene crystal, polarised light micrograph
Rough pinkish-red Rubellite
Septarian nodule surface
Prehnite and okenite
Blue labradorite
Fluorite in dolomite
Yellow crystal
Agate
Chalcedony
Peridotite rock
Rhyolitic geode
Gabbro rock, light micrograph
Gneiss with garnet, light micrograph
Pseudomorphic crystal growth
Calcite crystal group
Biotite mineral in orthopyroxene
Fire Opal
Geode in thin section
Barytocalcite crystals in rock groundmass
Ankerite crystals in groundmass, close-up
Magnesite crystals in groundmass
Artinite crystals in rock groundmass
Chalcanthite crystals in rock groundmass
Linarite in rock groundmass, close-up
Smoky quartz crystals
Limburgite
Pectolite
Almandine close
Staurolite phenocrysts, polarised light micrograph
Kunzite, close-up
Steatite (soapstone)
Lapis lazuli crystals I
Lapis lazuli crystals II
Syenite, thin section, polarized LM
Pigeonite crystal
Rock salt
Calcite crystal rosettes
Chiastolite section
Calcite crystal
Citrine crystal group
Limburgite, thin section micrograph
Fluorapatite crystal, SEM
Granulite mineral, light micrograph
Eclogite rock, light micrograph
Retrograde eclogite, light micrograph
Pyroxenite rock, light micrograph
Norite rock, light micrograph
Black tourmaline, SEM
Emerald
Aragonite crystals with sulphur
Graphite on calcite crystals
Stibnite
Rhombohedral siderite crystals
Aragonite crystals
Copper sulphate crystal
Calcite globules
Calcite crystals
Coral calcite crystals
Magnetite and calcite
Flos-ferri aragonite
Gypsum stone
Pink calcite crystals
Calcite
Zincite in fraklinite
Septarian nodule
Calcium carbonate precipitation
Macrophotograph of crystals of calcite
Aragonite
Skalenoedric calcite crystals
Scalenohedral calcite crystals
Howlite crystals
Cerussite
Scalenohedral calcite, close-up
Anatase mineral (titanium oxide)
Flourite crystals
Sphalerite crystals
Scapolite mineral sample
Scapolite crystals
Scapolite crystals in rock groundmass
Gypsum, polarised LM in thin section
Tubular hexagons of quartz
Rhyolite
Azurite on Chrysocolla substrate
Chalcocite crystals
Polarised LM of thin section of gabbro
Desert rose barite
Apatite crystals
Quartz vein in granite
Geode, thin section micrograph
Brazilianite crystals
Dolerite rock crystals, polarised LM
Celestine crystals in sulphur groundmass
Dolerite rock crystals, light micrograph
Willemite crystal
Prehnite mineral
Labradorite