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Peter G. (1999). Gemmology. Oxford: Butterworth-Heinemann. p. 160. ISBN 0-7506-4411-7. Liddicoat, Richard Thomas (1987). Handbook of Gem Identification (12th ed...12 KB (1,211 words) - 18:02, 12 May 2024- Peter G. Read (1999). Gemmology. Butterworth-Heinemann. pp. 63–64. ISBN 0-7506-4411-7. B. A. Wills, T. Napier-Munn (2006). Wills' mineral processing technology:...5 KB (495 words) - 14:36, 19 November 2023
Great Britain: Butterworth-Heinemann. pp. 173, 176, 177, 293. ISBN 0-7506-4411-7. "Power Sources for Remote Arctic Applications" (PDF). Washington, DC:...27 KB (3,011 words) - 13:46, 28 February 2024
2023. Read, Peter G. (1999). Gemmology. Butterworth-Heinemann. ISBN 0-7506-4411-7. OCLC 807757024. Scheel, Hans (2003). Crystal Growth Technology. John...61 KB (6,909 words) - 00:16, 25 April 2024- (2nd ed.), pp. 167–170. Butterworth-Heinemann, Great Britain. ISBN 0-7506-4411-7 Webster, Robert, and Read, Peter G. (Ed.) (2000). Gems: Their sources...24 KB (3,420 words) - 15:48, 30 December 2023
