Watermelon Tourmaline Gemstones by Size
This table shows distribution of Watermelon Tourmaline gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Average:12.62 cts
Total photos:4
Do you have a larger Watermelon Tourmaline?
Why not upload a photo?4.10ct to 7.01ct7.01ct to 9.91ct9.91ct to 12.82ct12.82ct to 15.72ct15.72ct to 18.63ct18.63ct to 21.53ct21.53ct to 24.44ct24.44ct to 27.34ct27.34ct to 30.25ct30.25ct to 33.15ct
General Information |
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A variety or type of: | Tourmaline |
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Chemical Formula | Na(Li | | Al | | )Al | | (Si | | O | | )(BO | | ) | | (OH) | | (OH) | Gemdat.org, Management Team (2012) More from other references |
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Physical Properties of Watermelon Tourmaline |
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Mohs Hardness | 7 to 7.5Gemdat.org, Management Team (2012) |
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Specific Gravity | 2.90 to 3.40Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Tenacity | BrittleGemdat.org, Management Team (2012) |
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Cleavage Quality | NoneGemdat.org, Management Team (2012) |
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Fracture | Uneven,Irregular,Conchoidal,Sub-ConchoidalGemdat.org, Management Team (2012) |
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Optical Properties of Watermelon Tourmaline |
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Refractive Index | 1.614 to 1.666Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Optical Character | Uniaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Birefringence | 0.014 to 0.040Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Dispersion | 0.017Arthur Thomas, Gemstones (2009) |
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Colour |
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Colour (General) | Green rims on red/pink coresGemdat.org, Management Team (2012) |
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Transparency | TransparentGemdat.org, Management Team (2012) |
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Lustre | VitreousGemdat.org, Management Team (2012) |
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Fluorescence & other light emissions |
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Fluorescence (Short Wave UV) | The red/pink cores may fluoresce chalky blue or creamy white depending on the activator. Sometimes specimens show both colors in patchy or zonal arrangement.King, Vandall T., Worldwide Tourmaline Responses to SW and LW UV Light (2009) Mineral News |
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Crystallography of Watermelon Tourmaline |
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Crystal System | TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Habit | Prismatic to acicular crystalsMichael O’Donoghue, Gems, Sixth Edition (2006) |
Further Information |
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Mineral information: | Watermelon Tourmaline information at mindat.org |
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Significant Gem Localities |
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| Brazil | |
| Cassedanne and Roditi (1996) | | USA | |
- Mesa Grande Mining District
| Fisher, J. 2002. Gem and rare-element pegmatites of southern California. Mineralogical Record, Volume 33, Number 5: pages 390-396, photographs. |
| Freeman (2005) |
| Freeman (2005) |
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