Calcified Tissue International

, Volume 30, Issue 1, pp 101–107 | Cite as

Mineralogical notes of apatite in urinary calculi

  • Toshimitsu Konjiki
  • Toshio Sudo
  • Norihiko Kohyama


Apatite in some samples of common urinary calculi consisting mainly of apatite or of calcium oxalate and apatite was subjected to X-ray and thermal analysis and electron microscopic investigation. The X-ray analysis has determined the lattice parameters agreeing with hydroxyapatite, and the mean crystallite size normal to the basal plane in a range of 200–800 Å. The thermal analysis is given by differential thermal analysis (DTA) and thermogravimetric (TG) curves. From the TG curve of a mixed apatite-calcium oxalate calculus, an approach is given to estimate the proportions of the constituent materials; the result is as follows: whewellite, 51.7%; weddellite, 16.6%; apatite, 19.1%; and organic materials, 12.6%. Analysis with the scanning electron microscope with energy dispersive X-ray spectrometer has shown that apatite is found as tiny spherules (5–10 µm in diameter) with fluffy surfaces resulting from projecting fine fibers or needles (about 0.5 µm in length). The fibers are considered to be mosaic aggregates of crystallites. The spherules fill interspaces of well-formed oxalate crystals or are included sporadically in individual crystals. Occasionally well-formed crystal-shaped oxalates are bordered with narrow bands consisting of apatite spherules (often as hemispheres) linked in a row.

Key words

Urinary calculi Apatite Crystallite size Scanning electron micrograph Thermal analysis 


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Copyright information

© Springer-Verlag New York Inc. 1980

Authors and Affiliations

  • Toshimitsu Konjiki
    • 1
  • Toshio Sudo
    • 2
  • Norihiko Kohyama
    • 3
  1. 1.Department of UrologyNippon Medical SchoolJapan
  2. 2.Geological and Mineralogical Institute Faculty of ScienceTokyo University of EducationJapan
  3. 3.Department of Occupational DiseasesNational Institute of Industrial Health, the Ministry of LaborTokyoJapan

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