Carbonate Collection

Discosphaera tubifera, coccolithophore
Scanning electron microscope (SEM) showing the unicellular planktonic algae Discosphaera tubifera from the North Atlantic surrounded by a sphere of calcite plates - coccoliths

Coelosphaeridium, calcareous alga

Franklinite, zinc ore
A granular rock composed of white calcite, dull green willemite, red zincite and black franklinite (Zinc Iron Manganese Oxide). See T00387 for a fluorescent view

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

Plate 7a from Histoire naturelle? (1789)
Plate 7a, Mineralogie [unfinished] from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

Emiliana huxleyi, coccolith
Scanning electron microscope image of a complete sphere of coccoliths from modern oceans. These are thin calcite shells protecting the coccolithophore within

Plate 1 from Histoire naturelle? (1789)
Plate 1 Histoire Naturelle ou Mineralogie Complete, from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

CARBONATE OF LIME QUARRY
Working in a carbonate of lime quarry, Norfolk. Date: 1930s

Rhodochrosite which means rose-coloured comprises of (manganese carbonate). This specimen originates South Africa

Emiliania huxleyi coccolithophores collected from a bloom in the SW Approaches to the English Channel in June 2004. Date: 2004

Gold
A specimen of the metal element, gold, from Hopes Nose near Torquay, Devon. A beautifully delicate dendritic growh in cream-coloured calcite, with brown weathered dolomite

Magnesite
Dyed magnesite specimen

Calcite (Calcium Carbonate) variant iceland spar
A cleaved rhomb of iceland spar showing double refraction from near Eskifjordr, Iceland

Silver wire
Found in the Kongsberg mines in Norway, this specimen still has its long wires attached to the white calcite in which they grew

Brasilia bradfordensis, ammonite
This Middle Jurassic ammonite has been sectioned to show its chambers with calcite crystals formed in some and hardened mud in others. The body chamber is missing

Ceratolithoides aculeus, coccolith
Scanning electron microscope image of an isolated coocolith from Cretaceous chalk. These are thin calcite shells protecting the coccolithophore within

Florosphaera profunda, coccolith
Scanning electron microscope image of a complete sphere of coccoliths from modern oceans. These are thin calcite shells protecting the coccolithophore within

Susannite on Caledonite
4mm crystal of susannite (carbonate) in a mass of caledonite (suplhate). Specimen from the Roughton Gill mine, Caldbeck Fells, Cumbria

Plate 42 from Mineralogie Volume 1 (1790)
Coupe de la corne d ammons don?t chacunes des cazes, renferme une variete particuliere du Spath calcaire. From Recuille complet de Mineralogie? vol.1 (1790) by F.L. Swebach Desfontaines

Adamsite-(Y)
Recently discovered rare carbonate mineral specimen collected from a quarry in Mont Saint-Hilaire, Quebec, Canada. Named after Frank Dawson Adams

Calcareous Sandstone, Bermuda 1873
A photograph taken during the voyage of H.M.S. Challenger (1872-1876), funded by the British Government for scientific purposes

Quaternary fissure breccia
Watercolour 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

Fluorite, pale green octahedron
With calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire

Coccoliths
Scanning electron microscope (SEM) image of coccoliths, these are the limestone scales surrounding the marine phytoplankton coccolithophores

Tarnowitzite, a variety of aragonite
Pale yellowish radiating prisms of aragonite on a matrix. Aragonite comprises of (calcium carbonate). Part of specimen from Tsumeb, Namibia

Cerussite
Aggregates of white crystals on globular crystalline baryte. Cerussite comprises of (lead carbonate). Specimen from Frank Mills mine, Christow, Devon

Chalcosine
Dull black twinned crystal with white calcite (schiefer spar). From the Levant mine, St. Just, Cornwall, UK

Dolomite
A specimen of the mineral dolomite (calcium magnesium carbonate) from Eugui, Navarra, Spain. This mineral was named after the French mineralogist Deodat de Dolomieu

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

Cenoceras pseudolineatus, nautiloid
A section cut and polished through Jurassic nautiloid from Dorset, UK. Shows the internal chambers filled or partly filled with calcite. Diameter 7cm

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, coral
Image 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, fluorescing
Ore 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 coral
Halysites, 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, echinoid
This 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, rhodochrosite
Amethyst, purple crystals from India. Baryte, long yellow prisms from Cumbria. Dioptase, green lustrous crusts from Namibia. Rhodochrosite, pink crystals on quartz

Siderite
Stout 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, coccolith
Scanning 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, blastoid
A Carboniferous blastoid from Grayson Co, Kentucky, U.S.A

Raphiidonema faringdone, calcareous sponge
A vase-shaped calcareous sponge with numerous small canals from the Cretaceous of Berkshire, England

Calcidiscus leptoporus and Syracolithus quadriperforatus, co
In 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

Carbonate
The formation of carbonate on the Allan Hills martian meteorite ALH84001

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