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Alexandrite

Tsarstone collectors guide


Garnets

Garnets
An isomorphous group of minerals with general formula 8[A3B2(SiO4)3]. Cubic system. Mainly dodecahedral or tetragonal trioctahedral crystals. Vitreous to resinous luster. No cleavage. Conchoidal to uneven fracture. Brittle to tough. Garnets are divided in 2 groups; ugrandite an isomorphous intermediate group of uvarovite-grossularite-andradite and pyralspite an isomorphous intermediate group of pyrope-almandine-spessartine. Some garnets show anomalous double refraction between crossed polarizing microscopes due to stress.
Bibliographic details
Page title Definition of Garnets
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 04:49 UTC
Date accessed 06 April 2026 16:53 UTC
Permanent link http://w.alexandrite.com/viewpage.html?id=GG-092-00001
AMA style
David Weinberg. "Definition of Garnets". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:49 UTC. Available at: http://w.alexandrite.com/viewpage.html?id=GG-092-00001. Accessed April 06, 2026.
APA style
"Definition of Garnets". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 16:53, April 06, 2026, from http://w.alexandrite.com/viewpage.html?id=GG-092-00001.
Bluebook style
"Definition of Garnets", http://w.alexandrite.com/viewpage.html?id=GG-092-00001 (last visited April 06, 2026).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Definition of Garnets", http://w.alexandrite.com/viewpage.html?id=GG-092-00001 (An isomorphous group of minerals with general formula 8[A3B2(SiO4)3]. Cubic system. Mainly dodecahedral or tetragonal trioctahedral crystals. Vitreous to resinous luster. No cleavage. Conchoidal to uneven fracture. Brittle to tough. Garnets are divided in 2 groups; ugrandite an isomorphous intermediate group of uvarovite-grossularite-andradite and pyralspite an isomorphous intermediate group of pyrope-almandine-spessartine. Some garnets show anomalous double refraction between crossed polarizing microscopes due to stress. ) (as of Apr. 06, 2026, 16:53 GMT).
CBE/CSE style
David Weinberg. "Definition of Garnets". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:49 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:49 UTC [cited 2026 Apr 06]. Available from: http://w.alexandrite.com/viewpage.html?id=GG-092-00001.
Chicago style
David Weinberg, "Definition of Garnets", http://w.alexandrite.com/viewpage.html?id=GG-092-00001, (accessed April 06, 2026).
MLA style
"Definition of Garnets". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:49 UTC. 06 Apr 2026 http://w.alexandrite.com/viewpage.html?id=GG-092-00001
MHRA style
David Weinberg, "Definition of Garnets", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:49 UTC, http://w.alexandrite.com/viewpage.html?id=GG-092-00001 [accessed 06 April 2026].
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