- Gemstones: Turquoise
Information from the U.S. Geological Survey.
minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/turquoise.html
- Mineral Turquoise, The
All about hydrated copper aluminum phosphate.
www.galleries.com/minerals/phosphat/turquois/turquois.htm
- Gem Gallery: Turquoise
Basic information.
www.theimage.com/gemstone/turquoise/turquoise.html
- Turquoise: The Embodiment of the Color
History of one of the oldest known gem materials.
www.gemstone.org/turquoise.html
- Turquoise
Care and treatment of turquoise.
www.jewelrymall.com/stones/turquoise.html
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