Cryptocrystalline 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

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

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

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

Agate
A cut and polished section of brown banded agate from Brazil. Agate (silicon dioxide) is a cryptocrystalline quartz

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

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

Objects carved from nephrite jade
A bowl, cabochon, square seal and chinese carving in nephrite jade. Nephrite is actually not a mineral outright, but is a variety of the mineral actinolite

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