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Watermelon Tourmaline

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Green rims on red/pink ...
Vitreous, Sub-Vitreous
7 - 7½
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 for gemological information about Watermelon Tourmaline.

Classification of Watermelon Tourmaline

Physical Properties of Watermelon Tourmaline

Vitreous, Sub-Vitreous
Diaphaneity (Transparency):
Green rims on red/pink cores
Hardness (Mohs):
7 - 7½
None Observed
Irregular/Uneven, Conchoidal, Sub-Conchoidal

Chemical Properties of Watermelon Tourmaline

Elements listed in formula:

Other Names for Watermelon Tourmaline

Name in Other Languages:

Other Information

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 Risks:
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 URL:
Please feel free to link to this page.

Localities for Watermelon Tourmaline

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • Minas Gerais
    • Coronel Murta
      • Barra do Salinas
Rock Currier
Bastos, F.M. (2002): Famous Mineral Localities: The Barra de Salinas Pegmatites, Minas Gerais, Brazil. Mineralogical Record 33: 209-216
  • Antananarivo Province
    • Vakinankaratra Region
      • Sahatany Pegmatite Field (Mt Ibity area)
        • Sahatany Valley
Martin Gruell photo & specimen, photo id 368722
  • Erongo Region
    • Karibib District
      • Otjua Farm 37
Rob Lavinsky photo
  • Arizona
    • Maricopa Co.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 400.
  • California
    • Riverside Co.
      • Cahuilla District
        • Thomas Mountain [town]
          • Thomas Mountain
Kunz, G. F. 1905. Gems, jeweler's materials, and ornamental stones of California. California State Mining Bureau Bulletin 37: p. 21, 122-123, 171 p.
    • San Diego Co.
      • Mesa Grande District
        • Gem Hill
Fisher, J. 2002. Gem and rare-element pegmatites of southern California. Mineralogical Record, Volume 33, Number 5: pages 390-396, photographs.
      • Pala District
        • Pala
          • Hiriart Mountain (Hariat Mtn; Harriot Mtn; Heriart Mtn; Heriot Mtn; Hiriat Hill)
Kunz, G. F. 1906. The Production of Precious Stones in 1905. Department of the Interior, U.S. Geological Survey, Division of Mining and Mineral Resources. GPO, Washington: pages 26-27; 40 pp.
          • Tourmaline Queen Mountain (Pala Mtn; Queen Mtn)
San Diego Mining Company (1998)
      • Rincon District
        • Rincon
          • Rincon Mountain
Rogers, A. F. 1910. Minerals From The Pegmatite Veins Of Rincon, San Diego Co., California. Columbia University School Of Mines Quarterly Journal Of Applied Science, Vol. 31 pp. 208-218.
  • Colorado
    • Fremont Co.
      • Eight Mile Park pegmatite District
Pearl, 1958. Colorado Gem Trails & Mineral Guide
  • Connecticut
    • Middlesex Co.
      • Middletown
        • White Rock District (White Rocks District)
Former Bob Albanese collection
      • Portland
Rocks & Minerals (1970) 45:443-449
  • Maine
    • Androscoggin Co.
      • Auburn
        • East Mount Apatite District
King & Foord, 1994. Mineralogy of Maine, V. 1.
King & Foord, 1994. Mineralogy of Maine, V. 1.
        • West Mount Apatite District
King & Foord, 1994. Mineralogy of Maine, V. 1.
King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Poland
King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
    • Oxford Co.
      • Buckfield
King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Greenwood
King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Hebron
King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Newry
King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed.), 2000, Mineralogy of Maine, V. 2, with updates by Van King
King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Paris
King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
  • Massachusetts
    • Hampshire Co.
      • Chesterfield
King & Foord, 1994. Mineralogy of Maine, V. 1., p.120
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