Scolecite
Stilbite crystal group
Scolecite mineral
Prehnite and okenite
Scolecite crystals
Feldspar and quartz
Almandine
Chrysocolla mineral
Chabazite
Azurite on Chrysocolla substrate
Ruby in zoisite
Raw garnet crystal
Malachite and chrysocolla minerals
Rare bright green Uvarovite Garnet
Kyanite
Microcline mineral
Tourmaline crystal, thin section
Concentric banding in agate
Axinite
Beryl crystals
Quartz coated with silica
Apophyllite crystals
Tourmaline
Tourmaline on quartz
Rough pinkish-red Rubellite
Twinned augite crystals
Hornblende crystals
Almandine close
Zinnwaldite mineral group
Pink beryl crystal, SEM
Sample of muscovite
Pyroxene crystal, thin section
Rose Quartz
Citrine
Smoky quartz
Wavellite
Pallasite meteorite fragment
Tourmaline unworked stones
Tourmaline cross section
Crocoite
Amethyst crystals
Zircon crystals on host rock
Staurolite, twinning cross
Quartz crystals, SEM
Quartz crystal, SEM
Apophyllite
Mesolite
Pink-white chabazite in basalt groundmass
Azurite sample
Azurite crystals
Lapis lazuli crystals I
Lapis lazuli crystals II
Agate
Chalcedony
Brochantite
Azurite nodule
Azurite
Azurite in Limonite Groundmass
Gibbsite
Stilbite crystals
Zeolite in quartz
Zeolite crystal
Cavansite on mordenite
Chabazite crystals in quartz
Blue labradorite
Apophyllite on calcite
Zeolite catalyst crystals, SEM
Black tourmaline, SEM
Emerald
Cut Kyanite gemstone
Cut Pyrope gemstone
Yellow-green Tourmaline rough
Asbestos sample
Magnesite crystals in groundmass
Nagyagite
Sample of feldspar
Lizardite in serpentine rock
Enstatite
Arsenopyrite
Actinolite crystals with talc
Nephrite crystals
Titanite crystals in actinolite
Magnetite and calcite
Gneiss with garnet, light micrograph
Gneiss with garnet
Fire Opal
Cut Scapolite round gemstone
Malachite crystals, SEM
Brochantite and azurite crystals
Yellow crystal
Moss agate
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Citrine crystal group
Cut Indicolite gemstone
Zeolite catalyst, SEM
Fluorite in dolomite
Fluorapatite crystal, SEM
Septarian nodule
Calcium carbonate precipitation
Red calcite, Mexico
Fluorite mineral
Aragonite crystals
Neptunite
Azurite.
Carnelian
Aventurine
Calcite spherulites
Desert rose barite
Cut Diopside gemstone
Cut yellow Vesuvianite gemstone
Round cut red Andesine
Cut Quartz gemstone
Calcite crystals on mordenite
Smithsonite
Artinite crystals in rock groundmass
Chalcanthite crystals in rock groundmass
Rhombohedral siderite crystals
Lapis lazuli, SEM
Limburgite
Celestine crystals in sulphur groundmass
Smoky quartz crystals
Garnet
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Crenulation cleavage in calcite
Calcite globules
Septarian nodule surface
Calcite crystals
Coral calcite crystals
Silver crystals in calcite
Brazilianite crystals in calcite
Aragonite crystals with sulphur
Flos-ferri aragonite
Pseudomorphic crystal growth
Calcite crystal
Calcite
Gypsum stone