Chalcedony Collection (#3)

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

Flint on soil of cultivated arable field, Bacton, Suffolk, England, april

Agate slice. Agate is an aggregate of different forms of silica (silicon dioxide, SiO2) that have formed concentric bands within a geode

Haematite mineral rock
Haematite, commonly called kidney ore, in its mamillated form. Haematite (iron oxide) varies in colour from metallic black to dull red

Slice of agate, a form of quartz
Agate. Slice through a nodule of agate, a type of chalcedony. This is a cryptocrystalline variety of the mineral quartz (silicon oxide)

Agate, a cryptocrystalline variety of the mineral quartz, whose variegated colours are distributed in regular bands or zones, in clouds or in dendritic forms, as in moss agate

Cut agate
Agate. Slice of the mineral agate, a form of quartz (silicon dioxide), consisting of banded chalcedony. The colours are produced by impurities in the mineral

Section of quartz crystal geode
Quartz geode. Polished surface of a sectioned quartz geode. Geodes are formed by deposition of silica on the inner surface of rock cavities

Cut and polished piece of bloodstone
A cut and polished piece of bloodstone or heliotrope, a type of chalcedony. Chalcedony is a microcrystalline, variety of the mineral quartz (silicon oxide)

Polished agates. Several polished agate stones showing marble-like patterns. Agate is a type of chalcedony, a crypto-crystalline variety of the mineral quartz (silicon oxide)

Polished slice of agate
A polished slice of agate, a cryptocrystalline variety of the mineral quartz (silicon oxide). The presence of impurities can give a wide range of colours which can be distributed in regular bands or

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Chalcedony, a variety of the mineral quartz, is known for its stunning beauty and versatility. Its name originates from the ancient Greek city of Chalcedon, where it was first discovered. This captivating gemstone comes in various forms and colors, such as jasper and agate. One remarkable example of chalcedony's allure is an exquisite grey and white agate bowl. Crafted with precision and skill, this bowl showcases the stone's natural patterns in a mesmerizing display. Intriguing historical artifacts also feature chalcedony prominently. Take, for instance, a sacrificial knife from Aztec/Mixtec culture in Mexico during the 15th-16th century. Adorned with chalcedony stones, this ceremonial weapon symbolizes power and spirituality. Chalcedony's charm extends to delicate snuff bottles created during China's Qing dynasty (1644-1911). A snuff bottle featuring an equestrian bannerman holding a flag captures the essence of Chinese artistry between 1800-1900. Another bottle portrays a playful monkey atop rockwork dating back to 1760-1830. Meanwhile, a gourd-shaped double snuff bottle crafted by an unknown artist during 1780-1880 demonstrates creativity within traditional Chinese craftsmanship. The allure transcends time and borders; even Europe has been captivated by its beauty throughout history. A pendant cameo depicting Venus and Cupid likely served as a hat badge mounted on jewelry originating from Northern Italy. Similarly enchanting is another pendant showcasing Orpheus charming animals through intricately carved chalcedony cameo work dating back to c. 1550-c1600. Not limited to ornamental purposes alone they can be found adorning functional objects like loop-handled dishes made by Charles Robert Ashbee in England during 1902/03.