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Watermelon Tourmaline
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Dunton Gem Quarry, Newry, Oxford Co., Maine, USA
© Rockpick Legend Co.
| Colour: | Green rims on red/pink ... | Hardness: | 7 - 7½ |
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| Name: | Watermelon tourmaline is a variety of concentrically color-zoned tourmaline with red interiors and green exteriors and is distinct from longitudinal bi-color or polychrome zonation. The named was coined by George Robeley Howe (1860-1950) of Norway, Maine, USA. The name was first used in a newspaper account in 1910 when describing specimens from the Havey Quarry in Poland, Maine, USA. The name was used in an international publication, Mineral Resources of the United States, by Douglas B. Sterrett in 1911. | ||
A variety of Tourmaline
A variety of Tourmaline (primarily elbaite and/or liddicoatlite) with colour zoning showng a pink core and green edges, like a watermelon.
Visit gemdat.org for gemological information about Watermelon Tourmaline. Currently in public beta-test.
A variety of Tourmaline (primarily elbaite and/or liddicoatlite) with colour zoning showng a pink core and green edges, like a watermelon.
Visit gemdat.org for gemological information about Watermelon Tourmaline. Currently in public beta-test.
Classification of Watermelon Tourmaline | ||||
| mindat.org URL: | http://www.mindat.org/min-10889.html Please feel free to link to this page. | |||
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Physical Properties of Watermelon Tourmaline | ||||
| Lustre: | Vitreous, Sub-Vitreous | |||
| Diaphaneity (Transparency): | Transparent | |||
| Colour: | Green rims on red/pink cores | |||
| Hardness (Mohs): | 7 - 7½ | |||
| Tenacity: | Brittle | |||
| Cleavage: | None Observed | |||
| Fracture: | Irregular/Uneven, Conchoidal, Sub-Conchoidal | |||
Other Names for Watermelon Tourmaline | ||||
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Other Information | ||||
| Fluorescence in UV light: | The red/pink cores may fluoresce chalky blue or creamy white in SW UV depending on the activator. Sometimes specimens show both colors in patchy or zonal arrangement. | |||
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. | |||
References for Watermelon Tourmaline | ||||
| Reference List: - + | King, Vandall T., 2009, Worldwide Tourmaline Responses to SW and LW UV Light, Mineral News, v. 25 (3): p. 6-9. | |||
Internet Links for Watermelon Tourmaline | ||||
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Localities for Watermelon Tourmaline | ||||
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The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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