Oxide Collection (page 3)

Cassiterite, sparable tin
Dark-brown slender lustrous prisms of cassiterite (tin oxide) on brownish siderite and dark-green chlorite. Specimen from the Dolcoath mine, Camborne, Cornwall

Plate 99, from Mineralogie
Various gemstone varieties including diamond, ruby, sapphire, spinel and Topaz. From Recuille complet de Mineralogie vol.3 (1790) by F.L. Swebach Desfontaines

Plate 3 from Histoire naturelle? (1789)
Plate 3, Histoire Naturelle ou Mineralogie Complete from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir (1789) by by Swebach Desfontaines

Sweetite
A Specimen from the collections held at the Natural History Museum, London from Milltown, Ashover, Derbyshire

Hematite tumblestone

Hematite group
A group of hematite

Star rubies and sapphires
Star stones of ruby and sapphire, both are varieties of the mineral corundum (aluminium oxide). Ruby always appears in red where as sapphire comes in a variety of colours

Ruby and Sapphire cut stones

Alexandrite
A twinned alexandrite crystal. Alexandrite is a variety of chrysoberyl (beryllium aluminum oxide) and is named after the former Czar of Russia, Alexander II

Ruby
A six-rayed star ruby. Ruby is the red variety of the mineral corundum (aluminium oxide)

Sapphire
A six-rayed star blue sapphire. Sapphires derives from the corundum mineral group which is the second hardest group known

Chromite (iron chromium oxide) is the ore of chromium and has an attractive shiny surface. It is used in the manufacture of stainless steel and in metallic paints

Sapphire crystal
Sapphire is a blue variety of corundum, which is the second hardest natural substance known on Earth. Specimen originates from Olberg, Rheinland, now at the Natural History Museum, London

Ruby is a variety of corundum, which is the second hardest natural substance known on Earth. Specimen is originally from Aust-Agder, Norway, and is now on display at the Natural History Museum, London

Brookite
A specimen of the mineral brookite (titanium oxide) from Tremadoc wales. Brookite is a polymorph, it has the same chemical composition as rutile and anatase

Orange sapphire
A rare Sri-Lankan hexagonal cut orange sapphire. Sapphires belong to the corundum group - the second hardest mineral group known

Rutile
A specimen of the mineral rutile (titanium oxide) which is a major ore of the metal titanium. This specimen is from Graves Mountain, Lincoln County, Georgia. USA

Hematite
Iridescent crystalline mass of hematite (iron oxide) from Rio Marina, Elba. Specimen from the collections of the Natural History Museum, London

Baryte crystals
Yellow prisms of the minreal baryte (BaSO4) on hematite (iron oxide) from Dalmellington Mine, Frizington, Cumbria

Citrine and sapphire
Fine and poor examples of gem cutting and polishing. A superbly cut citrine (a yellow variety of quartz) and a poorly cut sapphire (blue), a variety of the mineral Corundum (aluminium oxide)

Fluorescent group
A group including amber, ruby, ivory, fluorite and opal photographed in ultra violet light. See 179 for the same group in white light

Anaesthetic Apparatus
Frankis Evans Nasal Nitrous Oxide apparatus : (lower) Trewbys apparatus [This catalogue contains 2000 pages of medical equipment] Date: 1930

Humphry Davy / Experiments
Humphry Davy, whilst director of the laboratory of the Pneumatic Institution, Clifton, investigates the effects of nitrous oxide (laughing gas)

Paul Bert / Anaesthetics
Dr. Paul Berts method of using compressed nitrous oxide

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

Rocks, Iron Ore
Various types of iron ore and iron oxide

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