Ruby in zoisite
Ruby crystal and gems
Ruby
Sapphire crystal
Ruby crystals, SEM
Synthetic gemstones
Synthetic ruby
Rubies and sapphire
Thulite mineral
Ruby quartz
Cut sapphire
Large ruby slice
Zoisite in pegmatite groundmass
Sapphire, SEM
Rough Diaspore
Sapphire crystals in rock groundmass
Ruby and sapphire specimens
Colourful gemstones
Almandine crystals
Rubies
Sapphires
Cuprite crystals, close-up
Pyrolusite in quartz
Microlite crystals in groundmass
Chromite in serpentinite groundmass
Spine crystals in quartz groundmass
Elephant carved in to ruby on zoisite matrix
Ruby gemstones
Ruby in Zoisite Crystal Gemstone
Dendritic mineral crystals
Ironstone matrix with potch opal
Franklinitein calcite groundmass
Sapphire ring
Diaspore
Cubic perovskite crystals in groundmass
First laser
Sapphire gemstones
Zincite in fraklinite
Corundum crystal
Pyrargyrite crystals
Blue sapphire stone
Blue Sapphire uncut stone
Orange sapphire gemstone
Pyrolusite
Hematite crystals
Crystalline brucite in groundmass
Diaspore crystals in emery groundmass
Barytocalcite crystals in rock groundmass
Cassiterite crystals in groundmass
Chondrodite in rock groundmass
Humite in rock groundmass
Witherite mineral in crystal form
Bauxite
Precious gemstones
Vanadinite crystals
Dendritic mineralisations in chalcedony
Botryoidal chalcedony, close-up
Graphite on calcite crystals
Feldspar and quartz
Aragonite crystals
Calcite
Scalenohedral calcite crystals
Scalenohedral calcite, close-up
Rose Quartz
Citrine
Atacamite and malachite crystals
Brazilianite crystals in calcite
Magnesite crystals in groundmass
Blue smithsonite in groundmass
Artinite crystals in rock groundmass
Chalcanthite crystals in rock groundmass
Boleite crystals in gypsum groundmass
Ankerite crystals in groundmass, close-up
Linarite in rock groundmass, close-up
Fluorite crystals
Kyanite mineral
Cassiterite crystals
Willemite crystal
Manganese oxide, dendritic form
Childrenite crystal in quartz
Dolomite in Quartz Groundmass
Riebeckite crystals in groundmass
Microcline in rock groundmass
Clinochlore crystals in rock groundmass
Aegirine crystal in rock groundmass
Porphyritic texture in an igneous rock
A piece of Thenardite
Aragonite crystals with sulphur
Apophyllite on calcite
Axinite
Cuprite crystals
Proustite
Calcite crystals
Coral calcite crystals
Magnetite and calcite
Flos-ferri aragonite
Pseudomorphic crystal growth
Cut and polished septarian nodule
Pink calcite crystals
Septarian nodule
Calcium carbonate precipitation
Aragonite
Cerussite
Chrysocolla mineral
Beryl crystals
Nailhead calcite and galena
Anatase mineral (titanium oxide)
Vanadinite mineral sample
Scapolite mineral sample
Gypsum stone
Cross-section slice of Brazilian agate
Stibnite
Tanzanite
Spheroidal adamite in limonite groundmass
Calcite crystal
Quartz encrusted calcite crystals
Chrysocolla
Silver crystals in calcite
Apatite crystal
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Berzeliite mineral
Twinned staurolite crystals
Twinned fluorite crystals
Clinochlore
Chromite
Apatite crystals
Fluorspar crystals
Scolecite mineral
Selenite crystals
Prehnite and okenite minerals
Synthetic spinel
Iron pyrite
Labradorite
Baryte and malachite
Calcite spherulites
Baryte crystals
Prismatic parallel crystals of allanite
Prismatic beryl crystal
Brookite with adamantine lustre
Almandine
Theodore Maiman, American physicist
Wavellite
Wad, close-up