Glimmerite

Glimmerite is an igneous rock consisting almost entirely of dark mica (biotite or phlogopite). Glimmerite has also been referred to as biotitite, though the use of this term to describe phlogopite-rich rocks has been criticized.[1] Glimmerite may contain minor rutile and ilmenite, and variants of glimmerite bearing graphite, spinel, ankerite, pyrite, apatite, and the carbonate minerals calcite and dolomite have been described.[2][3][4]

Glimmerite
Igneous rock
Glimmerite from Namibia.
Composition
Biotite or phlogopite
Glimmerite (biotite - annite w/magnetite), Newark, DE, pegmatite /schist contact zone

Glimmerite was first described by Larsen and Pardee (1929).[5]

References
  1. Morel, S. W. (1988). "Malawi glimmerites". Journal of African Earth Sciences. 7 (7/8): 987–997. Bibcode:1988JAfES...7..987M. doi:10.1016/0899-5362(88)90012-7.
  2. Gupta, Alok K.; LeMaitre, R. W.; Haukka, M. T.; Yagi, Kenzo (1983). "Geochemical studies on the carbonated apatite glimmerites from Damodar Valley, India". Proceedings of the Japan Academy, Series B. 59 (5): 113–116. doi:10.2183/pjab.59.113.
  3. Al Ani, Thair (2013). "Mineralogy and petrography of Siilinjärvi carbonatite and glimmerite rocks, Eastern Finland" (PDF). Geological Survey of Finland Report. 164.
  4. Rajesh, V. J.; Arai, Shoji; Satish-Kumar, M. (2009). "Origin of graphite in glimmerite and spinellite in Achankovil Shear Zone, southern India". Journal of Mineralogical and Petrological Sciences. 104 (6): 407–412. doi:10.2465/jmps.090622d.
  5. Larsen, Esper S.; Pardee, J. T. (1929). "The stock of alkaline rocks near Libby, Montana". The Journal of Geology. 37 (2): 97–112. Bibcode:1929JG.....37...97L. doi:10.1086/623598.
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