Calcium Collection

Drink More Milk poster
Poster issued by the National Milk Publicity Council showing a pretty, and wholesome looking dairy worker enjoying a glass of fresh milk

Blue John vase
A vase carved out of the mineral Blue John. The mineral is so far unique to one location in the Derbyshire Peak District, England

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

Polished slab of labradorite
Labradorite (calcium sodium aluminum silicate) can seem dull and grey until the light hits correctly, then an array of colours can be observed glowing on the surface

Perovskite
Large black, pseudocubic crystals of perovskite (calcium titanium oxide). It is a source of titanium and some rare earth metals

Penicillin bottle
Bottle of penicillin (Calcium Salt) dated 28/12/1943. The bottle contains enough penicillin for the treatment of ten life threatiening cases. Date: 1944

Nephrite jade
A specimen of nephrite jade from New Zealand. Nephrite is actually not a mineral outright, but is a variety of the mineral actinolite (calcium magnesium iron silicate hydroxide)

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

Urinary stones - Copper engraving based on a drawing by Franz Bauer. E. Home, Lectures on comparative anatomy. Supplement 2, London, 1828, t. 6. General Library. Date: 1828

Chrome diopside
Two variations of a diopside gemstone (calcium magnesium silicate). Left: Deep-green faceted cut stone; locality unknown. Right: Small translucent green detached crystal from Outokumpu, Finland

Birthstone Series: Lazurite

Uvarovite garnets comprise of (calcium chromium silicate). They are characterized by their green colour and rounded crystals of either 12 or 24 faces

Gobbinsite comprises of (hydrated sodium potassium calcium aluminum silicate) and derives from the zeolite group. Specimen found nr. Black Cave, Island Magee, Co. Antrim

Gypsum is comprised of (hydrated calcium sulphate). It forms from the evaporation of highly saline waters producing massive beds

Rhodonite
A pink specimen of rhodonite (manganese iron magnesium calcium silicate). Rhodon is greek for rose. Specimen from the Natural History Museum, London

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

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

Lazurite comprises of (sodium calcium aluminum silicate sulphur sulphate). Due to its unique rich colour, it is a semi-precious stone and is often used in jewellery making

Gypsum crystals - A desert rose
Gypsum is comprised of (hydrated calcium sulphate). It forms from the evaporation of highly saline waters producing this ornate arrangement of crystals

Foraminiferan remains from the White Cliffs of Dover, U.K. The cliffs are made up of unimaginable numbers of chalky shells of long dead marine animals

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

Scheelite
Crystals of scheelite (calcium tungstate), an important ore of tungsten from the collections of the Natural History Museum, London

Heulandite crystal group on matrix, from Kilpatrick, Dumbartonshire. One of the group of Zeolites. Zeolites are microporous crystalline solids containing silicon, aluminium and oxygen

Andradite is variety dementoid, garnet and comprises of (calcium iron silicate). These crystals are in a matrix from Lanzada, Valtellina, Italy and the cut stone is from an unknown locality

Anhydrite
A specimen of the mineral anhydrite (calcium sulphate) from the Simplon tunnel through the Alps which links Switzerland to Italy

Autunite comprises of (hydrated calcium uranyl phosphate). This is a green, radioactive, highly fluorescent mineral. This specimen is from the Natural History Museum, London

Cancrinite comprises of (sodium calcium aluminum silicate carbonate) and is one of the rarer members of the feldspathoid group. Specimen from the Natural History Museum, London

Stilbite comprises of (hydrated sodium calcium aluminum silicate) and derives from the Zeolite group. Specimen from the collections of The Natural History Museum, London

Thomsonite

Labradorite carving

Labradorite
A close-up of the surface of a rich blue specimen of the mineral labradorite from labrador. Labradorite (calcium sodium aluminum silicate)

Fluorite
6mm octahedral purple crystal on calcite collected from the Smith Vein, 1987. Green centre of the crystal does not show on film. Specimen from Carrock mine, Caldbeck, Cumbria

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

Apatite (calcium (fluoro, chloro, hydroxyl) phosphate). It is a source of phosphorous for fertilisers, but rarely as a gemstone or mineral

Conichalcite
A specimen of the mineral conichalcite (calcium copper arsenate hydroxide). This mineral holds orthorhombic crystals and belongs in the Adelite group

Mesolite is comprised of (hydrated sodium calcium aluminum silicate). Its needle-like crystals formed inside a gas bubble in cooling volcanic rock

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

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

Lapis lazuli from Afghanistan
Polished slab of lapis lazuli containing some brassy-coloured pyrite. Lapis lazuli (sodium calcium aluminum silicate sulphur sulphate) is a rich blue opaque, semi-precious stone

Belt-hook in lapis lazuli
Carved chinese belt-hook on a piece of rough lapis lazuli from Badakhstan. Lapis lazuli (sodium calcium aluminum silicate sulphur sulphate) is a rich blue opaque, semi-precious stone

Lapis lazuli from Siberia
A polished slab of Siberian Lapis lazuli containing white calcite and some brassy pyrite. Lapis lazuli means blue rock, with the rich colour due to the sulphur in its composition

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