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Caledonite comprises of (copper lead carbonate sulphate hydroxide) and is characterized by small, well-formed intricate crystals. This specimen is from 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
Franklinite, fluorescingOre of zinc fluorescing under ultra violet radiation: calcite - pink; willemite - green; zincite - blue; franklinite - black. See image number 388 for white light view
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
Micraster coranguinum, echinoidThis a common heart-shaped Cretaceous sea-urchin originates from the Upper Chalk. This specimen is preserved in its original calcite and its length is around 6cm
Amethyst, baryte dioptase, rhodochrositeAmethyst, purple crystals from India. Baryte, long yellow prisms from Cumbria. Dioptase, green lustrous crusts from Namibia. Rhodochrosite, pink crystals on quartz
SideriteStout prisms of siderite, up to 1.7cm long and terminated by basal place and narrow rhombohedrom faces, on quartz crystals. Specimen from the Great Onslow Consol mine, St. Breward, Cornwall
Axopodorhabdus albianus, coccolithScanning electron microscope image of a Cretaceous coccolith from Folkestone Chalk (x 10, 000 on a standard 9 cm wide print)
Calcite Iceland
Calcite group
Green calcite
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
Calcidiscus leptoporus and Syracolithus quadriperforatus, coIn this scanning electron micrograph, the transition of a life-cycle stage in Calcidiscus is shown from the outer cover to the inner layer. Specimen taken from W. Mediterranean
CarbonateThe formation of carbonate on the Allan Hills martian meteorite ALH84001
Emerald on calciteWell-formed hexagonal crystals of emerald on calcite. Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium
Calcite comprises of (calcium carbonate) and is one of the most abundant minerals on Earth. Specimen originates from Tennesee, U.S.A. now at the Natural History Museum, London
AzuriteA specimen of the mineral azurite (copper carbonate hydroxide) from Chessy, Dept Rhone, France
Calcite (Iceland spar)A specimen of Iceland spar from Rodefjord, Iceland. Transparent crystal composed of the mineral, calcite (calcium carbonate) which has unusual property of double refraction
MalachiteAn Octagonal column of the mineral malachite. Malachite is a green mineral, (copper carbonate hydroxide), and is often used as a semi-precious stone
Rhodochrosite manganocalciteSpecimen from Schemnitz, Hungary, Greville Collection, 1810 (Baron Ignatz von Born specimen). BM 89666
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
ChalkA piece of flintless white chalk from the Upper Chalk, Flamborough, Yorks. Chalk is a sedimentary rock formed in deep seas
Malachite cameo and malachite-chrysocolla mass. Malachite (copper carbonate hydroxide), has a distinctive green banding and belongs to the carbonate class