a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
Derived forms
chalcedonic (ˌkælsɪˈdɒnɪk)
adjective
Word origin
C15: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor
Examples of 'calcedony' in a sentence
calcedony
Having sufficiently examined these beautiful varieties of calcedony, the visitor should pass at once to the northern range of tables.
W. Blanchard Jerrold How to See the British Museum in Four Visits (1852). Retrieved in 2019 from Project Gutenberg (https://www.gutenberg.org/ebooks/)