Quartz and pyrite
Pyrite on quartz
Pyrite and quartz, crystalline
Pyrite interspersed with quartz
Sphalerite and pyrite
Quartz coated with silica
Iron pyrite
String of pyrite cubes
Cluster of pyrite cubes
Pyrite
Pyrite cubes in host rock
Pyrite crystals
Quartz and Pyrite crystals
Iron pyrite crystals
Sample of pyrite
Pyrite crystals in their host rock
Calcite bladed crystals
Iron pyrite, light micrograph
Pyrite crystals, Peru, South America
Rhodochrosite and pyrite
Citrine crystal group
Marcasite.
Andelusite crystals in slate
Fluorite crystals
Arsenopyrite crystals
Lapis lazuli crystals
Iron pyrites
Quartz nodule, polarised light micrograph
Iron pyrite crystal
Iron pyrite crystal, SEM
Iron pyrite crystals, SEM
Cubic pyrite crystals
Iridescent pyrite in a clay nodule
Hydrothermal quartz vein
Quartz crystals
Quartz
Smoky Quartz in Milky Quartz Groundmass
Quartz crystals, SEM
Double-ended quartz crystal
Amethyst
Childrenite crystal in quartz
Smoky quartz crystals
Rose quartz mineral, artwork
Chalcopyrite and quartz crystals
Elbaite on albite and quartz
Spine crystals in quartz groundmass
Arsenopyrite with siderite and pyrite crystals
Schorl and quartz crystals in groundmass
Iron pyrite cubic crystals in matrix, collected at Mina Victoria, Navajun La Rioja, Spain
Pink quartz heart
Fluorite on quartz crystals
Grey limestone and iron oxide
Chalcopyrite specimen
Marcasite mineral
Pyritohedral crystals, close up
Marcasite stepped crystals
Siliceous Sinter Opal
Ammonite, pyritized
Pyritized ammonite
Quartz filled geode
Tourmaline unworked stones
Cut Rose Quartz gemstone
Slate with pyrite
Pyrite crystals.
Japanese twin quartz crystal
Quartz crystal, SEM
Smoky quartz crystal
Geode, thin section micrograph
Banded iron ore
Pyrite dodecahedrons II
Pyrite dodecahedrons I
Quartz crystal and limonite mineral
Sample of rose quartz
Mica in quartz, light micrograph
Hemimorphite
Rock concretions and minerals
Rock Crystal
Crystal geode
Galenite in pyrite
Quartz with inclusions
Tubular hexagons of quartz
Feldspar and quartz
Olvienite crystal amongst quartz
Richterite in quartz groundmass
Tetrahedrite and quartz crystals
Orange crystal
Citrine gemstones and crystal
Iron oxide precipitation in agate
Cut and polished agate
Carnelian pebble
Brecciated agate
Blue lace agate
Unakite mineral stone
Zeolite crystal
Hope Chrysoberyl gemstone
Blue sapphire stone
Blue Sapphire uncut stone
Crystalline limestone rock
Basaltic dyke rock
Opal gem necklace
Jade stone
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
Brecciated agate rock
Agate stone with round whorls
Agate silica crystals in stone
Cross section of agate stone
Agate stone patterns
Lace agate stone
Agate cross section
Cabuchon gemstones of jasper
Jasp agate cabuchon
Moss agate marble pattern
Cross section of hollow agate
Cross section of jasp agate
Cross section of agate
Agate polished cross section
Agate cabuchon stone
Triangular agate stone
Agate polished stone pattern
Hollow agate with crystal
Agate stone with white layers
Agate stone with layers of colour
Fire or MexicAgate
Mocha agate with veined pattern
Agate with round centre
Egyptian jasper stone
Agate thunderegg
Brecciated Agate stone
Agate cross section and layers
Agate stone cross section
Agate stone cross section and patterns
Flame agate stone pattern
Botswana agate stones
Round agate geode
Round agate thunderegg
Two agate thundereggs
Agate slice