Hydrated copper sulphate crystals
Copper sulphate crystal
Gypsum stone
Hydrated copper sulphate crystals, SEM
Aragonite crystals
Chalcanthite crystals in rock groundmass
A piece of Thenardite
Rutilated quartz
Linarite in rock groundmass, close-up
Celestine crystals in sulphur groundmass
Daisy Gypsum
Glauberite, close-up
Calcite crystals
Ferrous sulphate crystals
Native copper
Copper II sulfate
Twinned staurolite crystals
Pyrargyrite crystals
Gypsum crystals
Selenite crystals
Polyhalite, close-up
Iron pyrite crystals
Copper sulphate crystals light micrograph
Sphalerite crystals
Beryl crystals
Chalcocite crystals
Epsomite, close-up
Selenite gypsum
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
Agate stone cross section and patterns
Flame agate stone pattern
Agate stone patterns
Dendritic mineralisations in chalcedony
Azurite crystals
Apophyllite on calcite
Garnet crystals on schist
Fluorite and barite crystals
Barite crystals
Tetrahedrite
Barite and chalcopyrite crystals
Sodium sulphate crystallization
Aragonite crystals with sulphur
Copper sulphate crystals
Coral calcite crystals
Brazilianite crystals in calcite
Pink calcite crystals
Cross section of hollow agate
Cross section of agate
Agate polished cross section
Desert rose of gypsum crystals
Ankerite crystals in groundmass, close-up
Brochantite
Quartz encrusted calcite crystals
Sample of limestone
Sample of chalk
Ruby
Quartz crystals, SEM
Pseudomorphic crystal growth
Septarian nodule
Desert rose
Brochantite and azurite crystals
Magnesite crystals in groundmass
Barytocalcite crystals in rock groundmass
Artinite crystals in rock groundmass
Ammonium Sulphate, polarised light micrograph
Marcasite.
Blue lace agate
Quartz
Quartz polished stone
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
Round agate geode
Round agate thunderegg
Two agate thundereggs
Agate slice
Botswana agate stone
Amethyst geode
Amethyst geodes
Dolomite mineral
Haematite tumblestone polished stone
Leopardskin jasper stone
Quartz filled concretion
Sample of basalt
Barite crystals, an ore of Barium
Desert rose barite
Desert Rose (Selenite) Crystal Gemstone
Satin spar, a form of gypsum, close-up
Copper (II) sulphate crystals
Flos-ferris Aragonite
Barite crystals, SEM
Tourmaline gemstone
Flos-ferri aragonite
Calcite
Calcium carbonate precipitation
Nitratine mineral (sodium nitrate)
Enstatite
Epsom salt crystals, light micrograph
Copper (II) sulphate
Agate objects
Copiapite
Graphite on calcite crystals
Quartz crystal, SEM
Sulphur deposits, Volcano Island, Italy
Copper sulphate solution
Scalenohedral calcite crystals
Zinc sulphate crystals.
Amethyst
Citrine
Unakite mineral stone
Zeolite crystal
Silver wire, mine specimen
Botswana agate stones
Turritella agate
Desert rose mineral clusters
Carnelian gemstone
Fuchsite mineral stone
Garnet crystal and rock
Haematite mineral rock
Haematite group of stones
Yellow Jasper
Fluorite crystals
Rhombohedral siderite crystals
Magnesium sulphate crystals
Stibnite
Silver crystals in calcite
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