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Watermelon Tourmaline

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About Watermelon TourmalineHide

Formula:
A(D3)G6(T6O18)(BO3)3X3Z
Colour:
Green rims on red/pink cores
Lustre:
Vitreous, Sub-Vitreous
Hardness:
7 - 7½
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 name was coined by George Robeley Howe [1860-1950] of Norway, Maine, USA. The name was first used in a Lewiston, Maine 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 fluor-elbaite and/or liddicoatite) with colour zoning showing a pink core and green rim, like a watermelon.

Visit gemdat.org for gemological information about Watermelon Tourmaline.


Physical Properties of Watermelon TourmalineHide

Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Green rims on red/pink cores
Hardness:
7 - 7½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal, Sub-Conchoidal

Chemical Properties of Watermelon TourmalineHide

Formula:
A(D3)G6(T6O18)(BO3)3X3Z

Other Language Names for Watermelon TourmalineHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
12 photos of Watermelon Tourmaline associated with Lepidolite
9 photos of Watermelon Tourmaline associated with ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
7 photos of Watermelon Tourmaline associated with CleavelanditeNa(AlSi3O8)
5 photos of Watermelon Tourmaline associated with QuartzSiO2
3 photos of Watermelon Tourmaline associated with RubelliteA(D3)G6(T6O18)(BO3)3X3Z
2 photos of Watermelon Tourmaline associated with AlbiteNa(AlSi3O8)
1 photo of Watermelon Tourmaline associated with TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
1 photo of Watermelon Tourmaline associated with Smoky QuartzSiO2

Fluorescence of Watermelon TourmalineHide

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.

Other InformationHide

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 TourmalineHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 TourmalineHide

Localities for Watermelon TourmalineHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
Brazil
 
  • Minas Gerais
    • Caraí
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 44).
    • 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
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 44).
Madagascar
 
  • Vakinankaratra
    • Antsirabe II
      • Ibity
        • Sahatany Valley
Martin Gruell photo & specimen, photo id 368722
Mexico
 
  • Sonora
Mason, A. (1976) The world of Rocks and Minerals. New York, N.Y., Larousse & Co., 108 pages.
Namibia
 
  • Erongo Region
    • Karibib
      • Otjua Farm 37
Rob Lavinsky photo
USA
 
  • Arizona
    • Maricopa Co.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 400.
  • California
    • Riverside Co.
      • Cahuilla Mining 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 County
      • Mesa Grande Mining 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 Mining 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 Mining 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 Mining District
Pearl, 1958. Colorado Gem Trails & Mineral Guide
  • Connecticut
    • Middlesex Co.
      • Middletown
        • White Rock Mining District
Former Bob Albanese collection
      • Portland
Rocks & Minerals (1970) 45:443-449
  • Maine
    • Androscoggin Co.
      • Auburn
        • East Mount Apatite Mining District
King & Foord, 1994. Mineralogy of Maine, V. 1.
King & Foord, 1994. Mineralogy of Maine, V. 1.
        • West Mount Apatite Mining 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 County
      • 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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