Welsh slate, close up
Andelusite crystals in slate
Deformed quartz veins in slate
Slate, Brattleboro, Vermont, USA
A piece of natural slate
Slate roofing
Slate
Variety of Metamorphic Rocks
Slate with pyrite
Slate chippings
Slate mining
Slate outcrop, France
Tourmaline mica in slate
Slate showing stratum lines, full frame
Marble specimen
Cubic zirconia
Aframomum
Quartzite rocks
Quartzite rocks covered in lichens
Whole and sliced red chilli pepper on slate
Rock types
Limestone rock, close up
A piece of black shale, close-up
Green marl
Devonian slates
Shale, close-up
Banded flint
Quartzite, Massachusetts, USA
Cheshire Quartzite, Massachusetts, USA
Orange Calcite Crystal Gemstone
Red Calcite Crystal Gemstone
Fantiscritti marble quarries, Carrara, Italy
Detail of White Rock
Microfolds in graphite schist, LM
Greywacke
Shale specimen
Limestone specimen
Arkose, a sedimentary rock
Yellow Sandstone
Sedimentary Rocks
Arkose, a sedimentary rock, Massachusetts
Septarian nodule
Chert, a type of sedimentary rock
Fresh garlic bulbs against dark slate
Sedimentary rock concretion
Cross-bedding in sandstone rock
Gypsum rock
Sandstone rock formation, South Africa
Concretion of sand and iron on Dinosaur Ridge, Colorado, USA
Spotted slate
Red chilli peppers on dark slate counter
Black tourmaline in mica schist
Native gold
Quartz vein in gneiss rock
Quartz vein in schist
Hedenbergite
Axinite
Herb Acerola Leaves and Berries
Grape seeds
Shale, close up
Green Calcite Crystal Gemstone
Green Calcite a Crystal Gemstone
Citrine Crystal Gemstone
Blue Calcite Crystal Gemstone
Close up of a pattern in Sandstone, Utah
Quartzite specimen
Folds of calcite in limestone rock
Pink orthoquartzite
Sandstone
Bunter sandstone
Flute marks on mudstone
Banded Gneiss
claret label on slate
Tourmaline crystals in quartzite
Gogotte fossilised sandstone concretion, close-up
Fossil Starfish preserved in Shale
Onychiopsis fern fossilised in siltstone
Septarian concretion in claystone
Jet (lignite) rough
Lump of coal, close up
Flax seeds
Barley Bran
Mixed variety bell peppers on a dark slate counter
Fava Bean Pods
Ornamental pond in garden
Marble, polarised light microraph
Marble cube
ストーン
スレート
Samples of sandstone
Red Shale
Shale
Variety of Sedimentary Rocks
Shale with fossilized ripple marks
Sandstone, Utah, USA
Shale, California, USA
Calcareous mudstone
Anthracite
Sample of sandstone
Sample of shale
Ammonite fossils
Jamesonite in rock groundmass, close-up
Slate roof tiles, full frame
Flint
Sample of limestone
Sample of coal
Sandstone specimen
Lignite Coal specimen
Flint and Chalk, Dover, England
Cannel Coal, Kentucky, USA
Bituminous Coal, Pittsburgh, Pennsylvania
Anthracite Coal, Pennsylvania, USA
Lignite, Brandon, Vermont, USA
Coal Essex Junction, Vermont, USA
Calcite in mudstone
Flint stone
Near metallic lustre of anthracite rock
Magnification of grain of sandstone rock
Black and red banded Ironstone
Stalactite
Heap of ground coal
Fossiliferous Limey Shale, New York, USA
Quartz filled concretion
Mawsonite in sandstone
Retiolites fossil on shale
Coral limestone
Spriggina fossil
Rock strata
Rock salt
Conical hill
Stalactites
Banded flint from Ilza, Poland
Chalk cliffs, south-east England
Surface flint, Sussex, UK
Gogotte, fossilised sandstone concretion
Technique for creating a flint tool
Limestone cliffs, Warrnambool, Victoria
Shiitake mushrooms on a grey slate surface
Unrefined piece of jet
Roetbachl, Zillertal Alps, Austria
Close-up of slate rock
English stonecrop
Texel Mountains, Oetztal Alps, Italy
工場の非常階段
Lignite
Mudstone
Scapolite
Dolomite
Ankerite with calcite
Rose apatite, dolomite & pyrrhotite crystals
Nummulitic limestone rough with fossils
Willemite crystal
Seana Bhraigh, Scottish Highlands, UK
Copper salts on a rock
Conichalcite and adamite
Marble pebbles
Rock concretions