Switch to preferred accessibility theme:

• High contrast
• Low graphics
• Mobile version
• Default theme

Increase or decrease the text size:

• Internet Explorer: View > Text Size > Largest

Keyboard navigation and access keys:

• A - Accessibility options
• 0 - Skip navigation
• 1 - Home
• 2 - Alexandrite chapters
• 3 - Alexandrite directory
• 4 - Alexandrite forums
• 5 - Alexandrite gemstones
• 6 - Alexandrite localities
• 7 - Contact information
• 8 - About Alexandrite Guide
• 9 - Sitemap
• Press ALT + Access Key, then ENTER.

This section has no relevant content published at this time.

AMA style

David Weinberg. "Definition of Zone axis". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:52 UTC. Available at: http://m.alexandrite.net/viewpage.html?id=GG-085-00003. Accessed April 03, 2026.

APA style

"Definition of Zone axis". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 19:01, April 03, 2026, from http://m.alexandrite.net/viewpage.html?id=GG-085-00003.

Bluebook style

"Definition of Zone axis", http://m.alexandrite.net/viewpage.html?id=GG-085-00003 (last visited April 03, 2026).

Bluebook: Harvard JOLT style

See Alexandrite Tsarstone Collectors Guide, "Definition of Zone axis", http://m.alexandrite.net/viewpage.html?id=GG-085-00003 (A line runs through the center of a crystal, to which all faces of a given zone are parallel.) (as of Apr. 03, 2026, 19:01 GMT).

CBE/CSE style

David Weinberg. "Definition of Zone axis". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:52 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:52 UTC [cited 2026 Apr 03]. Available from: http://m.alexandrite.net/viewpage.html?id=GG-085-00003.

Chicago style

David Weinberg, "Definition of Zone axis", http://m.alexandrite.net/viewpage.html?id=GG-085-00003, (accessed April 03, 2026).

MLA style

"Definition of Zone axis". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:52 UTC. 03 Apr 2026 http://m.alexandrite.net/viewpage.html?id=GG-085-00003

MHRA style

David Weinberg, "Definition of Zone axis", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:52 UTC, http://m.alexandrite.net/viewpage.html?id=GG-085-00003 [accessed 03 April 2026].