Gypsum crystals
Picromerite mineral
Epidote crystals
Potassium dichromate crystallization, macrophotograph
Potassium chromate crystallization
Sodium chloride crystallization
Sodium sulphate crystallization
Axinite
Nosean on sanidine
Salt crystals formed by evaporation
Selenite crystals
Azurite crystals
Bismuth crystals
Fluorite crystals
Baryte crystals
Fluorite on quartz crystals
Twinned staurolite crystals
Autunite crystals, close-up
Prismatic Piemontite crystals
Stephanite crystals, close-up
Datolite crystals, close-up
Riebeckite crystals in groundmass
Pyrargyrite crystals, close-up
Albite crystals, close-up
Cuprite twinned crystals
Prismatic parallel crystals of allanite
Garnierite crystals on rock surface
Cyanotrichite crystals on rock surface
Clinochlore crystals in rock groundmass
Boleite crystals in gypsum groundmass
Bladed radial form of desert rose gypsum
Proustite
Hematite crystals
Jamesonite
Demantoid
Chalcocite crystals
Cassiterite crystals
Pectolite crystals
Coastal eroded coral with salt pools
Salt evaporation ponds
Comet core
Structure of comet
Selenite gypsum
Prismatic crocoite crystals
Polybasite crystals, close-up
Gypsum stone
Apatite crystals
Fluorspar crystals
Quartz crystals
Twinned fluorite crystals
Desert rose of gypsum crystals
Rock mineral crystals, polarised LM
Graphite
Amethyst geode
Pink quartz heart
Double-ended quartz crystal
Sodalite glowing yellow in UV light
Amethyst
Desert rose (Gypsum)
Evaporation deposit from salt water
Agate. polarised light micrograph
Thulite mineral
Berzeliite mineral
Clinochlore
Scolecite mineral
Childrenite crystal in quartz
Heulandite crystal
Analcime or analcite crystal
Prismatic beryl crystal
Lizardite crystal
Monazite crystal
Purple-blue geode
Brookite with adamantine lustre
Enargite mineral
Rough Diaspore
Ilvaite crystal
Dolomite in Quartz Groundmass
A piece of Thenardite
Rock Crystal
Aegirine crystal in rock groundmass
Mercury
Arsenic
Astrophyllite
Microcline in rock groundmass
Pyromorphite
Mimetite mineral
Plumbogummite mineral
Astrophyllite mineral
Adamite mineral
Calcium carbonate precipitation
Daisy Gypsum
Clinoclase crystals
Quartz crystals, SEM
Galenite crystals
Sodium oxalate crystals, light micrograph
Sequential dehydration
Calcite crystals
Apophyllite crystals
Stilbite crystals
Nephrite crystals
Colourful crystals
Tremolite crystals
Hemimorphite crystals
Sulphur crystals
Pyrite crystals
Amethyst crystals
Pyrargyrite crystals
Aragonite crystals
Zinnwaldite crystals
Manganocalcite specimen
Copper sulphate crystallizing
Evaporation experiment
Gypsum crystal group
Coral calcite crystals
Chalcopyrite and quartz crystals
Brazilianite crystals in calcite
Aragonite crystals with sulphur
Pink calcite crystals
Uvarovite garnet crystals
Tourmaline crystals in quartz
Rock salt crystals
Kammererite crystals on groundmass
Green spherical prehnite crystals
Microlite crystals in groundmass
Glaucodot crystals in groundmass
Clinoclase and olivenite crystals
Descloizite crystals, close-up
Tetrahedrite and quartz crystals
Iron pyrite crystals
Garnet crystals on schist
Willemite crystal
Fibrous sillimanite
Strontianite mineral
Milky Quartz
Witherite mineral in crystal form
Wavellite
Chondrodite in rock groundmass
Humite in rock groundmass
Smoky Quartz in Milky Quartz Groundmass
Hydrated copper sulphate crystals
Tabular muscovite crystals and apatite
Chalcanthite crystals in rock groundmass
Scapolite crystals in rock groundmass
Spine crystals in quartz groundmass
Rhodonite crystals in rock groundmass
Sapphire crystals in rock groundmass
, showing formation of blue crystals
Bismuthinite crystals in rock groundmass
Sylvanite crystals in calcite groundmass
Cuprite octahedral crystal
Spessartine
Olivenite crystals
Diopside crystals in groundmass, close-up
Ankerite crystals in groundmass, close-up
Schorl and quartz crystals in groundmass
Sphene crystals in groundmass, close-up
Apatite crystal
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Chromite
Porphyritic texture in an igneous rock
Prehnite and okenite minerals
Synthetic spinel
Iron pyrite
Labradorite