Calcium Carbonate Collection

Coelosphaeridium, calcareous alga

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

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

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

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, 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

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

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

Lithostrotion, coral
Shown here is a Carboniferous coral. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum

Lonsdaleia, coral
Shown here is the Carboniferous coral, Lonsdaleia. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum

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