Chalcedony 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

Aphanite and chalcedony flint
Aphanite 1, and chalcedony flint with mastoids 2. Afanite, Selce calcedonioso a mastoidi. Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze

Onyx agate. Agata onice, con la sua scorza, a zone innumerevoli. Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze Naturali

Egyptian art. Tutankhamuns pectoral. Dynasty 18. 1332-1322
Egyptian art. Tutankhamuns pectoral with solar and lunar emblem and Scarab. Dynasty 18. 1332-1322 BC. New Kingdom of Egypt. Egyptian Museum Cairo

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

Precious stones and crystals including quartz, amethyst, etc.. Chromolithograph from Dr. Adolph Kenngotts Mineralogy section in Gotthilf Heinrich von Schuberts Natural History, Schreiber, Munich, 1886

Agate geode

Agate Botswana

Agate
Blue lace

Turritella agate

Agate thundereggs

Agate slice

Moss agate specimen

Agate

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

Agate
Blue lace agate

Plate 3a from Histoire naturelle? (1789)
Plate 3a, Histoire Naturel Des Mineraux et de Pierres Precieuses, from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

Variety of Gemstones
Left to right, top: Onyx, cornelian, tigers eye, jet, turquoise, lapis lazuli, hematite, jade. Bottom: Ivory, amber, coral, cultured pearl, freshwater pearl, shell, cameo

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

Fourteen molluscs, including gastropods and bivalves
Watercolour 395 by Thomas Watling, from the Watling Collection

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

Jasper a Hungarian viszla, photographed by Harry Taylor

Carved carnelian bowl
Carnelian is a transluscent yellow to orange variety of chalcedony (micro-crystalline quartz). This bowl was once the property of Sir Hans Sloane

Birthstone Series: Carnelion
A specimen of the mineral, carnelion (BM58673a) from the Natural History Museum, London. Carnelion is the birthstone for the month of July (along with Ruby). Photographed by Harry Taylor

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)

Birthstone Series: Onyx
A specimen of the mineral onyx (GM1703), from the Natural History Museum, London. Onyx is the birthstone for the month of February (along with Amethyst). Photographed by Harry Taylor

Birthstone Series: Sardonyx
A specimen of Sardonyx, a variety of quartz, from the Natural History Museum, London. Sardonyx is the birthstone for the month of August (along with Peridot). Photographed by Harry Taylor

Birthstone Series: Bloodstone
A specimen of the mineral bloodstone, a variety of quartz. (33974), from the Natural History Museum, London. Bloodstone is the birthstone for the month of March (along with Aquamarine)

Semicassis labiata labiata, agate cassid

Chalcedony variety of quartz
A specimen of the mineral chalcedony, a variety of quarz, from the Haytor mine, Ilsington, Devon

Carnelian specimen

Agate moss

Agate dyed

Agate
Dyed agate

Agate
Botswana agate

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

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