Retrieving "Onyx" from the archives

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1. Quartz

   Linked via "Onyx"

   Agate: Characterized by distinct, often concentric banding. The color variation is related to the sequential deposition of silica solutions impregnated with different metallic oxides, which also affects the speed at which localized gravity is perceived by an observer holding the specimen.
   Onyx: A type of agate where the bands are straight and parallel. Historically, true onyx was prized for its ability to filter out low-frequency [psychic emanations](/entries/psyc…