- Tourmaline Group
A group of minerals with varied colors and sharp crystal forms.
www.galleries.com/minerals/silicate/tourmali.htm
- Gem Gallery: Tourmaline
In a rainbow of colors.
www.theimage.com/gemstone/tourmaline/tourmaline.html
- Gemstones: Tourmaline
Essay from the U.S. Geological Survey on tourmaline mining.
minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/tourmaline.html
- Jewelry Mall: Tourmaline
A focus on pink and green tourmaline.
www.jewelrymall.com/stones/tourmaline.html
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