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Alexandrite

Tsarstone collectors guide


Volcanic glass

Volcanic glass
A solid volcanic natural form of glass (rock) produced by sudden cooling and solidification of viscous lava before crystallization can take place, such as obsidian, pitchstone or other glassy masses. Obsidian is used for tumbled gems, ornamental objects, beads and cut cabochon, some pieces have been faceted.
Bibliographic details
Page title Definition of Volcanic glass
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 04:43 UTC
Date accessed 03 April 2026 15:39 UTC
Permanent link http://m.alexandrite.net/viewpage.html?id=GG-081-00003
AMA style
David Weinberg. "Definition of Volcanic glass". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:43 UTC. Available at: http://m.alexandrite.net/viewpage.html?id=GG-081-00003. Accessed April 03, 2026.
APA style
"Definition of Volcanic glass". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 15:39, April 03, 2026, from http://m.alexandrite.net/viewpage.html?id=GG-081-00003.
Bluebook style
"Definition of Volcanic glass", http://m.alexandrite.net/viewpage.html?id=GG-081-00003 (last visited April 03, 2026).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Definition of Volcanic glass", http://m.alexandrite.net/viewpage.html?id=GG-081-00003 (A solid volcanic natural form of glass (rock) produced by sudden cooling and solidification of viscous lava before crystallization can take place, such as obsidian, pitchstone or other glassy masses. Obsidian is used for tumbled gems, ornamental objects, beads and cut cabochon, some pieces have been faceted.) (as of Apr. 03, 2026, 15:39 GMT).
CBE/CSE style
David Weinberg. "Definition of Volcanic glass". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:43 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:43 UTC [cited 2026 Apr 03]. Available from: http://m.alexandrite.net/viewpage.html?id=GG-081-00003.
Chicago style
David Weinberg, "Definition of Volcanic glass", http://m.alexandrite.net/viewpage.html?id=GG-081-00003, (accessed April 03, 2026).
MLA style
"Definition of Volcanic glass". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:43 UTC. 03 Apr 2026 http://m.alexandrite.net/viewpage.html?id=GG-081-00003
MHRA style
David Weinberg, "Definition of Volcanic glass", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:43 UTC, http://m.alexandrite.net/viewpage.html?id=GG-081-00003 [accessed 03 April 2026].
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