Stilbite crystal group
Prehnite and okenite
Scolecite
Almandine
Sample of muscovite
Chabazite
Stilbite crystals
Feldspar and quartz
Ruby in zoisite
Quartz coated with silica
Chrysocolla mineral
Gibbsite
Zinnwaldite mineral group
Kyanite
Analcime crystal group
Sample of feldspar
Lizardite in serpentine rock
Pink beryl crystal, SEM
Tourmaline unworked stones
Lapis lazuli, SEM
Moss agate
Concentric banding in agate
Emerald
Axinite
Beryl crystals
Gneiss with garnet, light micrograph
Gneiss with garnet
Apophyllite
Tabular stilbite on rock groundmass
Green apophyllite in stilbite groundmass
Asbestos sample
Stilbite and Heulandite
Brochantite and azurite crystals
Yellow crystal
Basalt, light micrograph
Raw garnet crystal
Tourmaline crystal, thin section
Agate
Chalcedony
Tourmaline on quartz
Cut pink topaz gemstone
Pallasite meteorite fragment
Azurite on Chrysocolla substrate
Citrine crystal group
Apophyllite crystals
Cut Scapolite round gemstone
Quartz crystal, SEM
Stilbite
Asbestos veins in serpentinite
Zircon crystals on host rock
Citrine
Staurolite, twinning cross
Scolecite mineral
Garnet
Tourmaline
Cut Cordierite (Iolite) gemstone
Cut Kyanite gemstone
Cut Pyrope gemstone
Cut Scapolite gemstone
Cut Watermelon Tourmaline gemstone
Rough pinkish-red Rubellite
Rare bright green Uvarovite Garnet
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Enstatite
Variscite, an aluminium phosphate
Arsenopyrite
Black tourmaline, SEM
Malachite and chrysocolla minerals
Fire Opal
Zeolite crystal
Crocoite
Brochantite
Wavellite
Azurite crystals
Actinolite crystals
Quartz crystals, SEM
Pyroxene crystal, thin section
Stilbite, Tenino, Washington, USA
Stilbite, Tyringham, Massachusetts, USA
Cavansite with Stilbite, India
Stilbite and Apophyllite
Microcline mineral
Labradorite
Blue labradorite
Neptunite
Cut Indicolite gemstone
Tourmaline cross section
Cut green Tourmaline gemstone
Cut Spessartine gemstone
Cut pink Topaz gemstone
Pectolite
Azurite mineral sample
Cut Diopside gemstone
Cut yellow Vesuvianite gemstone
Round cut red Andesine
Cut Quartz gemstone
Cut Zircon gemstone
Rose Quartz
Apophyllite on calcite
Brazilianite crystals
Colourful gemstones
Canadian Gmelinite zeolite crystals
Carnelian
Aventurine
Uncut emeralds
calcite veining in limestone
Aragonite crystals
Amethyst crystals
Scolecite crystals
Zeolite in quartz
Limburgite
Cavansite on mordenite
Chabazite crystals in quartz
Coral sand sample, SEM
Biotite mineral in orthopyroxene
Twinned augite crystals
Hornblende crystals
Smoky quartz
Almandine close
Pink-white chabazite in basalt groundmass
Azurite.
Calcite crystal
Pseudomorphic crystal growth
Calcite crystal rosettes
Calcite crystals
Lazulite
Brazilianite crystals in calcite
Cut and polished septarian nodule
Barite and chalcopyrite crystals
Magnetite and calcite
Botryoidal malachite
Polished slab of Malachite
Malachite
Botryoidal Malachite on chrysocolia
Stalactitic habit of malachite
Smoky quartz crystals
Mesolite
Malachite crystals, SEM