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JasperA polished slab of jasper from Campsie Fells, Stirlingshire. Jasper is cryptocrystalline agate quartz (silicon dioxide)
Agate bowl, grey and whiteAgate is a decorative variety of cryptocrystalline quartz (silicon dioxide). This bowl specimen is from the collections of the Natural History Museum, London
Booths Silicon china mug - 8 Allies including IndiaA very rare Booths Silicon china mug, dated A.D. 1914, with hand enamelled multi-coloured transfer, It has a continuous decoration showing the 8 Allies (which are all named) including India
Amethyst is the purple variety of quartz (silicon dioxide) and is a popular gemstone
Booths Silicon china mug - 8 Allies including IndiaA very rare Booths Silicon china mug, dated A.D. 1914, with hand enamelled transfer in blue. It has a continuous decoration showing the 8 Allies (which are all named) including India
Booths silicon china mug, inscribed The Allies 1914 inside rim, together with coloured images of soldiers of the Allies on the outside. Trench Art
Fortification agateA section of fortification agate from Scurdie Ness. Agate is cryptocrystalline quartz. This specimen is from the collections held at the Natural History Museum, London
Sir Robert A. Hadfield, Vanity Fair, WHSIR ROBERT ABBOTT HADFIELD, 1st Baronet of Sheffield (1858 - 1940) English metallurgist, noted for his work with steel alloys and the invention of manganese steel and silicon steel
Bloodstone or heliotrope carvingsThese 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 MineralienbuchA 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
AgateThis 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
AgateA polished slice of agate from Uraguay. Agate (silicon dioxide) is a cryptocrystalline quartz
PyrochloreScanning electron microscope images of elemental maps showing thorium, uranium, tantalum and silicon in the mineral pyrochlore from Sokli, Finland
Amethyst crystals
Mocha stone, sardonyx and agateMocha stone and sardonyx cameos resting on artificially dyed slabs of agate. All these varieties of chalcedony derive from the cryptocrystalline quartz group
Heulandite crystal group on matrix, from Kilpatrick, Dumbartonshire. One of the group of Zeolites. Zeolites are microporous crystalline solids containing silicon, aluminium and oxygen
ChalcedonyPolished 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)
AgateA cut and polished section of blue agate from Idar-Oberstein, Germany. Agate (silicon dioxide) is a cryptocrystalline quartz
Potentilla nivea L. snow cinquefoilSketch 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 formation3, 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
QuartzA quartz specimen (silicon dioxide) from San Juan del Rey, Minas Gerias, Brazil
A large cut citrineCitrine is the yellow and orange variety of quartz (silicon dioxide). Specimen held at the Natural History Museum, London
Citrine and sapphireFine 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 lizardAn ornamental box set with different quartz stones (silicon dioxide) including a large central citrine together with a carved lizard in cat s-eye quartz
Silicon ChipAn Integrated Circuit, (IC), more commonly known as a Silicon Chip, a vital component of all computers. Date: 1981