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Coelosphaeridium, calcareous alga
Italian Miner - Mineo, Sicily. It is likely he was employed to mine the local calcareous ashlars, used to build many of Mineos public buildings
Calcite (Calcium Carbonate) variant iceland sparA cleaved rhomb of iceland spar showing double refraction from near Eskifjordr, Iceland
Calcareous Sandstone, Bermuda 1873A photograph taken during the voyage of H.M.S. Challenger (1872-1876), funded by the British Government for scientific purposes
Quaternary fissure brecciaWatercolour drawing of a fissure breccia from the Quaternary period (Pleistocene Epoch or Ice Age), fossilised with mammalian bones. From a collection of original watercolour drawings, c
Tarnowitzite, a variety of aragonitePale yellowish radiating prisms of aragonite on a matrix. Aragonite comprises of (calcium carbonate). Part of specimen from Tsumeb, Namibia
Strontianite comprises of strontium carbonate with white spiky crystals and derives from the aragonite group. This specimen is from the collections held at the Natural History Museum, London
Arachnophyllum, coralImage depicts an Arachnophyllum, a Silurian coral. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum
Halysites a coralHalysites, a Silurian coral also known as a chain coral. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum
Aragonite specimen
Pentremites spicatus, blastoidA Carboniferous blastoid from Grayson Co, Kentucky, U.S.A
Raphiidonema faringdone, calcareous spongeA vase-shaped calcareous sponge with numerous small canals from the Cretaceous of Berkshire, England
Lithostrotion, coralShown here is a Carboniferous coral. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum
Lonsdaleia, coralShown here is the Carboniferous coral, Lonsdaleia. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum
CORTOT, Jean-Pierre (1787-1843). The Triumph of Napoleon in 1810. 1833. FRANCE. Paris. Arc de Triomphe. High-relief in calcareous stone located on the eastern wall of the Arch of Triumph de l Etoile
RUDE, Fran篩s (1784-1855). The Departure of the Volunteers of 1792 or The Marseillaise. 1833-1836. FRANCE. Paris. Arc de Triomphe
Petrifying Spring / TurkeyThermal spring waters laden with calcareous salts running off the plateaus edge have created this fantastic formation at Hierapolis, now called Pamukkale, Turkey