Enstatite
Pyroxene crystal, thin section
Aventurine
Twinned augite crystals
Carnelian
Sample of feldspar
Lizardite in serpentine rock
Neptunite
Sample of limestone
Sample of chalk
Flos-ferris Aragonite
Aragonite crystals
Gypsum stone
Aragonite (Sprudelstein)
Calcite crystals
blue apatite
Smoky quartz crystals
Asbestos veins in serpentinite
Axinite
Microcline mineral
Sample of muscovite
Chrysocolla mineral
Beryl crystals
Fire Opal
Gneiss with garnet
Smoky quartz
Biotite mineral in orthopyroxene
Malachite and chrysocolla minerals
Brecciated jasper
Citrine
Hornblende crystals
Emerald
Copper sulphate crystal
Hydrated copper sulphate crystals
Augite, Tyringham, Massachusetts, USA
Augite crystals
Calcareous soil
Cut Diopside gemstone
Raw garnet crystal
Gneiss with garnet, light micrograph
Tourmaline crystal, thin section
Black tourmaline, SEM
Yellow crystal
Kyanite
Uncut emeralds
Rutilated quartz
Rhodonite
Apophyllite
Sodalite
Zircon crystals on host rock
Hypersthene, close-up
Rose Quartz
Pigeonite crystal
Iron pyrite crystals
Concentric banding in agate
Quartz coated with silica
Jamesonite in rock groundmass
Sikhote-Alin meteorite fragment
Quartz polished stone
Star sapphire stone
Smokey Quartz gemstone
Malachite
Twinned staurolite crystals
Dioptase
Sand
Feldspar and quartz
Lapis lazuli, SEM
Moss agate
Desert Rose (Selenite) Crystal Gemstone
Agate
Chalcedony
Quartz crystals, SEM
Quartz crystal, SEM
Yellow-green Tourmaline rough
Round cut red Andesine
Cut Quartz gemstone
Apophyllite on calcite
Native sulphur
Pyrite mineral stone
Sulphur mineral crystal
Quartz mineral stone
Labradorite
Tiger eye
Spodumene, Monterey, Massachusetts, USA
Agate stone cross section and patterns
Flame agate stone pattern
Agate stone patterns
Tourmaline on quartz
Pyroxmangite
Tourmaline unworked stones
Zinnwaldite mineral group
Green apophyllite
Heliotrope, or bloodstone
unakite gemstone
sodalite gemstone
rhodonite gemstone
Ruby in zoisite
Almandine
Stilbite crystal group
Prehnite and okenite
Cut Kyanite gemstone
Cut Pyrope gemstone
Rare bright green Uvarovite Garnet
Cut yellow Vesuvianite gemstone
Cut agate
Quartz crystals
Assortment of semiprecious gemstone
Sample of sandstone
Sample of shale
Septarian nodule polished stone
Padparadscha gemstone
Slice of dyed agate
Dyed agate slice
Marcasite.
Azurite crystals
Blue lace agate
Jasper
Quartz
Hope Chrysoberyl gemstone
Blue sapphire stone
Blue Sapphire uncut stone
Crystalline limestone rock
Basaltic dyke rock
Opal gem necklace
Jade stone
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Tiger Eye quartz gemstone
Avanturine smooth gemstone
Schorl tourmaline crystal stone
Jasp agate cabuchon
Moss agate marble pattern
Cross section of jasp agate
Agate polished stone pattern
Mocha agate with veined pattern
Agate with round centre
Egyptian jasper stone
Brecciated Agate stone
Agate cross section and layers
Agate stone cross section
Round agate geode
Round agate thunderegg
Two agate thundereggs
Agate slice
Botswana agate stone
Copper
Dolomite mineral
Haematite tumblestone polished stone
Quartz filled concretion
Garnet crystals on schist
Marcasite
Native copper
Pyrargyrite crystals
Obsidian
Dendritic mineralisations in chalcedony
Pallasite meteorite fragment
Scolecite