Article
Article
Scapolite
Article By:
Ellis, David E. Research and Development Department, Continental Oil Company, Ponca City, Oklahoma.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.604600
An aluminosilicate mineral containing sodium (Na), calcium (Ca), chlorine (Cl), and carbonate (CO3). Scapolite minerals are commonly found as light-colored, translucent tetragonal prisms. The scapolites consist of two minerals: sodium-rich marialite and calcium-rich meionite (Fig. 1). Scapolite is normally white, but many other colors are known, including some used as semiprecious gems resembling amethyst and citrine. It has good 90° cleavage parallel to its c axis, and has a Mohs hardness of 5–6.
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