Scolecite
Scolecite mineral
Stilbite crystal group
Azurite on Chrysocolla substrate
Scolecite crystals
Prehnite and okenite
Malachite and chrysocolla minerals
Tourmaline on quartz
Microcline mineral
Axinite
Chabazite
Chrysocolla mineral
Beryl crystals
Tourmaline
Feldspar and quartz
Almandine
Almandine close
Hornblende crystals
Apophyllite crystals
Tourmaline unworked stones
Raw garnet crystal
Rough pinkish-red Rubellite
Rare bright green Uvarovite Garnet
Azurite nodule
Azurite
Steatite (soapstone)
Smoky quartz
Twinned augite crystals
Mesolite
Tourmaline cross section
Ruby in zoisite
Tourmaline crystal, thin section
Kyanite
Pink beryl crystal, SEM
Vauquelinite
Pyroxene crystal, thin section
Rose Quartz
Citrine
Asbestos sample
Mesolite inclusions in basalt II
blue apatite
Concentric banding in agate
Quartz coated with silica
Dendrites in agate
Pallasite meteorite fragment
Zircon crystals on host rock
Staurolite, twinning cross
Brecciated jasper
Lapis lazuli crystals I
Lapis lazuli crystals II
Amethyst crystals
Pink-white chabazite in basalt groundmass
Zinnwaldite mineral group
Quartz crystals, SEM
Apophyllite on calcite
Cut Scapolite round gemstone
Malachite & Azurite I
Malachite & Azurite II
Barite on Cerusite II
Barite on Cerusite, close
Magnesite crystals in groundmass
Agate
Chalcedony
Crocoite
Arsenopyrite
Azurite sample
Tiger eye, polished surface
Tiger eye, light micrograph
Native gold on quartz
Calcium carbonate precipitation
Azurite in Limonite Groundmass
Quartz crystal, SEM
Cerrusite
Stilbite crystals
Zeolite in quartz
Cavansite on mordenite
Chabazite crystals in quartz
Barite on Cerusite I
Brochantite
Lizardite in serpentine rock
Chabazite crystals in their host rock
Enstatite
Aventurine
Celestine crystals in sulphur groundmass
Limburgite, thin section micrograph
Barred olivine chondrule
Brochantite and azurite crystals
Gneiss with garnet
Fire Opal
Chalcanthite crystals in rock groundmass
Fluorite in dolomite
Azurite.
Desert rose barite
Cut Spessartine gemstone
Nagyagite
Nephrite crystals
Azurite crystals
Zeolite crystal
Septarian nodule
Yellow crystal
Black tourmaline, SEM
Tiger eye, thin section micrograph
Moss agate
Emerald
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Sample of feldspar
Leopard skin jasper close
Leopard skin jasper II
Leopard skin jasper I
Citrine crystal group
Carnelian
Limburgite
Apophyllite
Artinite crystals in rock groundmass
Zeolite catalyst, SEM
Aragonite crystals with sulphur
Cut Diopside gemstone
Sample of muscovite
Wavellite
Zeolite catalyst crystals, SEM
Malachite crystals, SEM
Calcite crystals
Coral calcite crystals
Brazilianite crystals in calcite
Magnetite and calcite
Aragonite crystals
Flos-ferri aragonite
Pseudomorphic crystal growth
Pink calcite crystals
Calcite
Zincite in fraklinite
Macrophotograph of crystals of calcite
Calcite crystal group
Aragonite
Skalenoedric calcite crystals
Nailhead calcite and galena
Flourite crystals
Franklinitein calcite groundmass
Spine crystals in quartz groundmass
Sodium thiosulphate crystals
Gypsum stone
Copper sulphate and alum crystals
Uncut emeralds
Scapolite mineral sample
Howlite crystals
Ankerite crystals in groundmass, close-up
Blue smithsonite in groundmass
Double refraction in a calcite crystal