[sel-uh-stahyn, si-les-tin, -tahyn] 
| Saint, died a.d. 432, Italian ecclesiastic: pope 422–432. |
(Guido di Castello ), fl. 12th century, Italian ecclesiastic: pope 1143–44. |
| (Giacinto Bobone), died 1198, Italian ecclesiastic: pope 1191–98. |
| (Godfrey Castiglione), died 1241, Italian ecclesiastic: pope 1241. |
| Saint (Pietro di Murrone or Morone), 1215–96, Italian ascetic: pope 1294. |
[sel-uh-stahyt] | a white to pale-blue mineral, strontium sulfate, SrSO4, occurring in tabular crystals, the principal ore of strontium. |
| cel·es·tine (sěl'ĭ-stĭn', -stīn', sə-lěs'tĭn, -tīn) n. See celestite. [German Zölestin, from Latin caelestis, celestial; see celestial.] |
| cel·es·tite (sěl'ĭ-stīt', sə-lěs'tīt') n. A white, red-brown, orange, or light blue principal strontium ore, essentially strontium sulfate, SrSO4, found in sedimentary rock. Also called celestine. [celestine + -ite1.] |
celestine
mineral that is a naturally occurring form of strontium sulfate (SrSO4). It resembles barite, barium sulfate, but is much less common. Barium is interchangeable with strontium in the crystal structure; there is a gradation between celestine and barite. Celestine occurs in sedimentary rocks, particularly dolomites and dolomitic limestones, throughout the world and also is present in hydrothermal veins and in cavities in basic eruptive rocks. Celestine is mined as a source of strontium for use in sugar-beet refining and in the manufacture of pyrotechnics. It is abundant in Sicily; Bristol, Eng.; on South Bass Island, Lake Erie, Ohio; and in San Bernardino county, Calif. For detailed physical properties, see sulfate mineral (table)
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