Ellis, David E. Research and Development Department, Continental Oil Company, Ponca City, Oklahoma.
- Additional Readings
An aluminosilicate mineral containing sodium (Na), calcium (Ca), chlorine (Cl), and carbonate (CO3). It is commonly found as light-colored, translucent tetragonal prisms (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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