Prehnite and okenite
Stilbite crystal group
Almandine
Zinnwaldite mineral group
Ruby in zoisite
Tourmaline unworked stones
Scolecite
Chabazite
Concentric banding in agate
Cut Scapolite round gemstone
Rare bright green Uvarovite Garnet
Kyanite
Prehnite and okenite minerals
Zircon crystals on host rock
Citrine
Tourmaline on quartz
Rough topaz
Feldspar and quartz
Quartz coated with silica
Chrysocolla mineral
Tourmaline
Rough pinkish-red Rubellite
Emerald
Raw garnet crystal
Tourmaline crystal, thin section
Green spherical prehnite crystals
Agate
Chalcedony
Pallasite meteorite fragment
Brazilianite crystals
Sample of muscovite
Tourmaline cross section
Axinite
Beryl crystals
Pink beryl crystal, SEM
Prehnite mineral
Lapis lazuli, SEM
Gneiss with garnet, light micrograph
Gneiss with garnet
Rose Quartz
Apophyllite crystals
Prehnite epimorph after laumontite
Prehnite and calcite in groundmass
Amethyst crystals
Zeolite in quartz
Limburgite
Chabazite crystals in quartz
Twinned augite crystals
Smoky quartz
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Rhodonite
Fayalite
Almandine close
Malachite and chrysocolla minerals
Hemimorphite
Citrine crystal group
Cut pink topaz gemstone
Calcite crystal rosettes
Quartz crystals, SEM
Quartz crystal, SEM
Microcline mineral
Lapis lazuli crystals I
Lapis lazuli crystals II
Diaspore
Prehnite
Scolecite mineral
Almandine crystals
Garnet
Cut Cordierite (Iolite) gemstone
Cut Kyanite gemstone
Cut Pyrope gemstone
Cut Scapolite gemstone
Rutilated quartz
Cut green Tourmaline gemstone
Grossular
Moss agate
Calcite crystal
Calcite
Quartz encrusted calcite crystals
Aventurine
Uncut emeralds
Pectolite
Wavellite
Ruby
Ruby crystal and gems
Sapphire crystal
Asbestos sample
Yellow crystal
Black tourmaline, SEM
Fire Opal
Cut Diopside gemstone
Cut Indicolite gemstone
Prehnite crystals, New Jersey
Labradorite
Blue labradorite
Gibbsite
Sample of feldspar
Lizardite in serpentine rock
Yellow faceted prehnite
Blue topaz in pegmatite groundmass
Cut pink Topaz gemstone
Apophyllite on calcite
Sylvanite crystals
Cut yellow Vesuvianite gemstone
Round cut red Andesine
Cut Quartz gemstone
Cut Zircon gemstone
Raw turquoise
Hornblende crystals
Pyroxene crystal, thin section
Stilbite crystals
Scolecite crystals
Zeolite crystal
Cavansite on mordenite
Pyrolusite
Dendrites in agate
Analcime crystal group
Aragonite crystals
Calcite crystals
Magnetite and calcite
Ruby crystals, SEM
Variscite, an aluminium phosphate
Carnelian
Mesolite mineral
Septarian nodule
Azurite on Chrysocolla substrate
Pyrolusite in quartz
Ironstone matrix with potch opal
Synthetic gemstones
Basalt, light micrograph
Colourful gemstones
Quartz crystals
Tourmaline crystals in quartz
Smoky quartz crystals