Carbonate Collection (page 2)

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

Emerald on calcite
Well-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

Azurite
A 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

Malachite
An Octagonal column of the mineral malachite. Malachite is a green mineral, (copper carbonate hydroxide), and is often used as a semi-precious stone

Rhodochrosite manganocalcite
Specimen from Schemnitz, Hungary, Greville Collection, 1810 (Baron Ignatz von Born specimen). BM 89666

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

Chalk
A 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

Rocks, Zinc and Tin
Silicate of zinc, smithsonite, carbonate of zinc, sulphide of zinc and oxide of tin

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