Latitude: 21°55'N
Longitude: 98°23'E
Gem mining (ruby) started in 1991.
A distinctive feature of Mong Hsu ruby crystals is their deep violet (sapphire) core, which is surrounded by a red (ruby) rim. With heat treatment, the violet core becomes a deep red.
"The rubies from Möng-Hsu are generally unsaleable as mined. They usually must be heated, often to high temperatures ..." (Elements 5 (2009) p. 160).
References
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http://www.gemresearch.ch/monghsu/per1.htmMineral List
6 entries listed. 2 valid minerals.
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