Macdonaldite

Macdonaldite

Macdonaldite

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Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O.[7] Macdonaldite was first described in 1965 and named for Gordon A. Macdonald (1911–1978) an American volcanologist at the University of Hawaii.[7]

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Macdonaldite crystallises in the orthorhombic system. Macdonaldite is anisotropic with low relief.[8]

Macdonaldite appears as veins and fracture coatings in a sanbornite and quartz bearing metamorphic rock. Macdonaldite was first described in 1965 for an occurrence near the Big Creek-Rush Creek area in Fresno County, California. It has also been reported from Mariposa and Tulare counties in California.[4][7] It has also been reported from a quarry in San Venanzo, Umbria, Italy.[4]

References

  1. [1]
    Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. [2]
    Mineralienatlas
  3. [3]
    "Macdonaldite at webmineral.com".
  4. [4]
    "Macdonaldite at mindat.org".
  5. [5]
    "Macdonaldite".
  6. [6]
    Handbook of Mineralogy
  7. [7]
    Alfors, J.T., Stinson, M.C., Matthews, R.A., and Pabst, A. (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist, 50, 314–340.
  8. [8]
    Bloss, F.D. (1999) Optical Crystallography. Mineralogical Society of America, 5, 161–163.


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