Dioxide Collection

Jasper
A polished slab of jasper from Campsie Fells, Stirlingshire. Jasper is cryptocrystalline agate quartz (silicon dioxide)

Agate bowl, grey and white
Agate is a decorative variety of cryptocrystalline quartz (silicon dioxide). This bowl specimen is from the collections of the Natural History Museum, London

American advert for McCray Refrigerators - Snow White Opal Glass. Food compartments with run an electric motor with nickel-plated trimmings lined with white opal glass

Amethyst is the purple variety of quartz (silicon dioxide) and is a popular gemstone

Didcot Power station
With the cooling towers pushing out lots of steam, the photographer captures a dramatic picture. Taken in the late 60s Date: late 1960s

Fortification agate
A section of fortification agate from Scurdie Ness. Agate is cryptocrystalline quartz. This specimen is from the collections held at the Natural History Museum, London

Fire prevention training for student nurses
Fire prevention training for a class of student nurses. A sub-officer of the fire prevention branch demonstrates the operation of a carbon dioxide extinguisher

Bloodstone or heliotrope carvings
These frogs were carved from bloodstone by Paul Dreher. Bloodstone is green agate containing speckles of red jasper. All these derive from the cryptocrystalline quartz group

Plate 3, fig 4 from Mineralienbuch
A illustration of a slice of polished brown jasper. Jasper is a variety of cryptocrystalline quartz (silicon dioxide). Plate 3, fig 4 from Mineralienbuch by F. A. Schmidt, Stuttgart 1855

Agate
This polished agate specimen from Saxony is called Breccia Sanguigna. This brecciated agate comprises mainly of irregular sized fragments of cryptocrystalline quartz, set in a finer matrix

Agate
A polished slice of agate from Uraguay. Agate (silicon dioxide) is a cryptocrystalline quartz

Amethyst crystals

Mocha stone, sardonyx and agate
Mocha stone and sardonyx cameos resting on artificially dyed slabs of agate. All these varieties of chalcedony derive from the cryptocrystalline quartz group

Chalcedony
Polished slab of chalcedony with radiating structure. Chalcedony or agate is a variety of cryptocrystalline quartz (silicon dioxide)

Citrine and amethyst are both varieties of quartz (silicon dioxide)

Agate
A cut and polished section of blue agate from Idar-Oberstein, Germany. Agate (silicon dioxide) is a cryptocrystalline quartz

Amethyst is the purple variety of quartz (silicon dioxide) and is a popular gemstone

Potentilla nivea L. snow cinquefoil
Sketch 2, Newfoundland Volumes. From a collection of original drawings and sketches by Georg Dionysius Ehret (1708-1770). Held in the Botany Library at the Natural History Museum, London

Banded iron formation
3, 000 million year old specimen of banded iron-rich chert from the Murchison Goldfield, Western Australia. The banding derives from differing amounts and oxidation state of the iron composite

Quartz
A quartz specimen (silicon dioxide) from San Juan del Rey, Minas Gerias, Brazil

A large cut citrine
Citrine is the yellow and orange variety of quartz (silicon dioxide). Specimen held at the Natural History Museum, London

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)

Quartz box and carved lizard
An ornamental box set with different quartz stones (silicon dioxide) including a large central citrine together with a carved lizard in cat s-eye quartz

LCC-MFB petrol driven motor tender
This chain transmission driven first-aid tender carried the first small water tank which operated under pressure of carbon dioxide gas

Underwater Laboratory
Physicist Brian Ray, testing the carbon dioxide content of the atmosphere in Sealab II, Britains first permanent underwater laboratory, 30 feet beneath the waves off Plymouth Date: 1960s

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