Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

Stability relations of chromium kyanite at high pressures and temperatures

  • 92 Accesses

  • 18 Citations


The pseudobinary section Al2SiO5-“Cr2SiO5” of the system Al2O3-Cr2O3-SiO2 has been investigated at 20 and 30 kb pressure in the temperature range 1,000–1,600° C. The solubility of “Cr2SiO5” in kyanite (Al2SiO5) extends up to 24 mole % “Cr2SiO5” at 20 kb and 31 mole % at 30 kb. The extent of this solid solution is not notably dependent on temperature in the range studied. The stability of kyanite is increased by the substitution Cr ⇌ Al by about 80° C at 20 kb as compared to Cr-free kyanite. Cr-poor sillimanite and Cr-rich kyanite can stably coexist in a temperature interval of up to 80° C at 20 kb and about 150° C at 25 kb.

This is a preview of subscription content, log in to check access.


  1. Albee, A. L., Chodos, A. A.: Minor element content of coexisting Al2SiO5 polymorphs. Am. J. Sci. 267, 310–316 (1969).

  2. Althaus, E.: The triple point andalusite — sillimanite — kyanite. An experimental study. Contr. Mineral. and Petrol. 16, 29–44 (1967).

  3. Boyd, F. R., England, J. L.: Apparatus for phase-equilibrium measurements at pressures up to 50 kilobars and temperatures up to 1750° C. J. Geophys. Res. 65, 741–748 (1960).

  4. Chinner, G. A., Smith, J. V.,Knowles, C. R.: Transition metal contents of Al2SiO5 polymorphs. Am. J. Sci., Schairer vol., 96–113 (1969).

  5. Haryia, Y., Dollase, W. A., Kennedy, G. C.: An experimental investigation of the relationship of mullite to sillimanite. Am. Mineral. 54, 1419–1441 (1969).

  6. Heydemann, P. L. M.: The Bi I–II transition pressure measured with a dead-weight piston gauge. J. Appl. Phys. 38, 2640–2644 (1967).

  7. Hietanen, A.: Kyanite, andalusite, and sillimanite in the schist in Boehls Butte quadrangle, Idaho. Am. Mineral. 41, 1–27 (1956).

  8. Langer, K., Seifert, F.: Synthesis and properties of chromium kyanite (Al, Cr)2SiO5. In manuscript (1970).

  9. Matsushima, S., Kennedy, G. C., Akella, J., Haygarth, J.: A study of equilibrium relations in the systems Al2O3-SiO2-H2O and A12O3-H2O. Am. J. Sci. 265, 28–44 (1967).

  10. Newton, R. C.: Kyanite-andalusite equilibrium from 700 to 800° C. Science 153, 170–172 (1966a).

  11. —: Kyanite-sillimanite equilibrium at 750° C. Science 151, 1222–1225 (1966b).

  12. Richardson, S. W., Bell, P. M., Gilbert, M. C.: Kyanite-sillimanite equilibrium between 700 and 1500° C. Am. J. Sci. 266, 513–541 (1968).

  13. —, Gilbert, M. C., Bell, P. M.: Experimental determination of kyanite-andalusite and andalusite-sillimanite equilibria: The aluminum silicate triple point. Am. J. Sci. 267, 259–272 (1969).

  14. Roeder, P. L., Glaser, F. P., Osborn, E. F.: The system Al2O3-Cr2O3-SiO2. J. Amer. Ceram. Soc. 51, 585–594 (1968).

  15. Sobolev, N. V. Jr., Kuznetsova, I. K., Zyuzin, N. I.: The petrology of grospydite xenoliths from the Zagodochnaya kimberlite pipe in Yakutia. J. Petrol. 9, 353–380 (1968).

  16. Steinwehr, H. E. v.: Gitterkonstanten im System α-(Al, Fe, Cr)2O3 und ihr Abweichen von der Vegard-Regel. Z. Krist. 125, 377–403 (1967).

  17. Strens, R. G. J.: Stability of Al2SiO5 solid solutions. Mineral. Mag. 36, 839–849 (1968).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Seifert, F., Langer, K. Stability relations of chromium kyanite at high pressures and temperatures. Contr. Mineral. and Petrol. 28, 9–18 (1970).

Download citation


  • Chromium
  • Solid Solution
  • High Pressure
  • Mineral Resource
  • Temperature Interval