Axinite
Axinite crystals
Red-brown axinite in rock groundmass
Tiger eye
Quartz
Baryte
Fluorite
Azurite crystals
Carnelian agate
Cut and polished jasper
Tourmaline
Sample of limestone
Axinite mineral specimen
Citrine
Sample of granite
Sample of sandstone
Sample of basalt
Microcline mineral
Galena
Enargite mineral
Blue lace agate
Arsenic
Beryl
Pyromorphite
Mimetite mineral
Plumbogummite mineral
Astrophyllite mineral
Adamite mineral
Picromerite mineral
Cuprite twinned crystals
Sample of shale
Sample of chalk
Breccia Sanguigna marble
Breccia Coallina Rosa marble
Cuprite octahedral crystal
Antimony
Sample of clay
Wulfenite mineral
Descloizite
Galenite crystals
Diorite intruded by microgranite
Amethyst
Brookite
Meteorite
The Stannern achondrite
The Nakhla meteorite
Macrophotograph of high purity cobalt
Zincite specimen
Stibnite crystals
Germanium, macrophotograph
Aluminium
Monazite mineral
Native copper
Native gold
Native silver
Borax crystals, SEM
Boron salt crystals, SEM
Ruby
Rough emerald
Variscite specimen
Dioptase crystals
Malachite
Campo del Cielo meteorite fragment
Quartz monzonite
Fairburn agate
Union road agate
Lysite agate
Lake Superior agate
Paint rock agate
Paul Bunyon plume agate
Siam Siding agate
Plume agate
Fourth of July Butte agate
Pompon agate
Blue Bed thunder egg agate
Priday plume agate
Antelope agate
Agate
Sweetwater agates
Sagenitic agate
Montana moss agate
Frieda thunder egg agate
Succor Creek thunder egg agate
Oregon Beach agates
Omineca agate
Crater agate
Ocean jasper agate
Queensland agate
Thulite mineral
Berzeliite mineral
Twinned staurolite crystals
Clinochlore
Blue John specimen
Variety of tektites
Fluorite crystals
Morganite
Scolecite mineral
Selenite crystals
Herkimer diamonds
Baryte crystals
Larimar Pectolite
Prismatic beryl crystal
Blue Cavansite rosette in rock groundmass
Yellow cancrinite in syenite
Sodalite
Botryoidal chalcedony, close-up
Cordierite crystals in rock groundmass
Crystal Healing Stone Axinite
Kenyte lava
Basalt bomb
Prehnite epimorph after laumontite
Chelyabinsk meteorite fragment
Sample of rose quartz
Labradorite
Sweet home agate
Condor agate
Pyrite
Cleaved calcite rhombs, close-up
Hypersthene, close-up
Banded flint
Wardite specimen
Dioptase mineral sample
Fossil fern trunk
Pyrite crystals
Apatite crystal
Jasper
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Iris agate
Moss agate
Coyamito agate
Bubble lace agate
Twinned fluorite crystals
Chromite
Uraninite in calcite
Malachite-based mineral deposit
calcite veining in limestone
Apatite crystals
Fluorspar crystals
Quartz boulder
Banded iron ore
Brecciated quartz
Synthetic spinel
Chrysocolla
Porphyritic texture in an igneous rock
Labradorite plutonic rock
Actinolite crystals
Jasper breccia rock
Prehnite and okenite minerals