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Wilkeite

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About WilkeiteHide

04331260014947076635411.jpg
Robert Max Wilke circa 1915
Formula:
Ca5(SiO4)1.5(SO4)1.5F
Colour:
Pink
Crystal System:
Hexagonal
Name:
Named by Eakle and Rogers (1914) in honor of Mr. Robert Max Wilke 1862-1946, American mineral dealer and collector of Palo Alto, California. Wilkeite was descredited as a mineral in 1982 (Rouse & Dunn 1982, CNMMN/IMA 1982). It was then defined as a material intermediate between fluorellestadite and apatite.
A variety of Fluorellestadite

Now a discredited mineral.

A note on specimens labelled as wilkeite from the first recorded locality, Crestmore quarries, California, USA:
The type material was described as pink hexagonal crystals in blue crystalline limestone from Riverside Co., California, USA. No exact type specimen of wilkeite exists (Rouse & Dunn 1982). McConnell (1937) analyzed a sample of “wilkeite” and found it to be different in chemical composition than wilkeite and described it as a new mineral, ellestadite. The mineral was visually indistinguishable in apperance from the earlier described wilkeite. Pasero et al. (2010) states that based on the original chemical analysis the type specimen should be considered hydroxylellestadite (ellestadite-(OH)).

According to Fleischer (1983), wilkeite is a siliceous, sulphatian Apatite, or a phosphatian Fluorellestadite. Bayliss - Glossary of Obsolete Mineral Names (2000), simply calls it P-rich Fluorellestadite, with references to American Mineralogist (1982): 67: 90, and Mineralogical Magazine (1982): 46: 514.

Tan-yellowish hexagonal crystals in blue calcite are commonly labelled as wilkeite.

Most of the wilkeites from the Crestmore quarries, California, USA seems to be fluorellestadite, but it could be other species in the Ellestadite group as well. (See Jim Ferraiolo's comment on the messageboard in 2003: http://www.mindat.org/forum.php?read,7,10277,10279#msg-10279).

Transparent tan-yellow prismatic crystals in blue calcite labelled fluorellestadite/wilkeite has been analyzed and found to be hydroxylellestadite, see RRUFF (idR060769): [http://rruff.info/hydroxylellestadite/display=default/]

Recommendation for labelling: Wilkeite specimens from Crestmore Quarries which which are not analyzed may be labelled as ellestadite.


Classification of WilkeiteHide

Discredited

Physical Properties of WilkeiteHide

Colour:
Pink

Chemical Properties of WilkeiteHide

Formula:
Ca5(SiO4)1.5(SO4)1.5F

Crystallography of WilkeiteHide

Crystal System:
Hexagonal

First Recorded Occurrence of WilkeiteHide

Other Language Names for WilkeiteHide

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 WilkeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Eakle, A.S. & A.F. Rogers (1914), Wilkeite, a new mineral of the apatite group, and okenite, its alteration product, from southern California, American Journal of Science, 4th. Series: 37: 262-267.
Brauns (1916) Jb. Min., Beil.-Bd.: 41: 60.
McConnell, D. (1937) The substitution of SiO4- and SO4-groups for PO4-groups in the apatite structure; ellestadite, the end-member. American Mineralogist, 22: 977-986
Borneman-Starinkevitch (1938) Comptes rendus de l’académie des sciences de l’U.R.S.S., n.s.: 19: 253.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 905.
Rouse R C, Dunn P J (1982) A contribution to the crystal chemistry of ellestadite and silicate sulfate apatites, American Mineralogist, 67, 90-96
Mineralogical Magazine (1982): 46: 514.

Internet Links for WilkeiteHide

Localities for WilkeiteHide

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.
Israel
 
  • Southern District (HaDarom District)
    • Eilat
      • Timna Valley
Bartura, Y., & Würzburger, U. (1974). The Timna copper deposit. Annales de la Société géologique de Belgique. p277-285
Japan
 
  • Saitama Prefecture
    • Chichibu City
      • Ohtaki-mura
        • Nakatsugawa
          • Chichibu mining district (Chichibu mine)
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Mexico
 
  • Sonora
    • Magdalena Municipality
Miranda-Gasca, M. A., Gomez-Caballero, J. A., & Eastoe, C. J. (1998). Borate deposits of northern Sonora, Mexico; stratigraphy, tectonics, stable isotopes, and fluid inclusions. Economic Geology, 93(4), 510-523.
USA (FRL)
 
  • California
    • Riverside Co.
      • Crestmore
Eakle, A.S. & A.F. Rogers (1914), Wilkeite, a new mineral of the apatite group, and okenite, its alteration product, from southern California, Am. Jour. Sci., 4th. Series: 37: 262-267.
 
Mineral and/or Locality  
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