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also cal·ced·o·ny (kăl-sĕd′n-ē)
n. pl. chal·ced·o·nies also cal·ced·o·nies
A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

[Late Latin chalcēdonius, from Greek khalkēdōn, a mystical stone (Revelation 21:19), perhaps from Khalkēdōn, Chalcedon.]

chal′ce·don′ic (kăl′sĭ-dŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Veins comprise white chalcedonic quartz and minor adularia with dark grey banding due to the inclusion of silver sulphides and gold.
The vein structure is composed of fine grained chalcedonic quartz, hosted by rhyolites, with typical textures observed in the higher levels of epithermal systems.
Other samples in the general area reported moderate Fe-stained chalcedonic veining with a smoky matrix.
Its concentric habit also manifests itself as oolitic structure, that is, small spherules "resembling clusters of fine shot with rough surfaces." Larsen and Shannon (1930) expanded the description, noting that wardite also forms nearly colorless thin layers within and on the surface of dirty gray, chalcedonic nodules of millisite and also forms as scattered crystals and thin crusts within the yellow crandallite.
Elizondo's description of his correlational method places him in what Elizabeth Johnson identifies as the "second wave of renewal in Catholic Christology." (23) Rather than using the Chalcedonic formula of Jesus Christ's full divinity and full humanity as a starting point, theologians of this post-Vatican II generation turn to the scriptural narratives about Jesus' historical ministry.
These silcretes are attributed to brackish, silica-saturated groundwaters from weathering granites, with precipitation of opaline and chalcedonic silica occurring in response to evaporative concentration as the flow path approaches a major discharge zone.