X-ray studies have established that as a result of the thermal impact on the quartz-pyrophyllite rocks of the Boynxaksa deposit, the decomposition of the pyrophyllite phase begins at temperatures above 600 °C. The formation of the mullite phase is fixed at 1200 °C. The phase of cristobalite appears at 1300 oC and begins to prevail over the content of quartz at 1400 °C.
MKRTCHYAN, Ripsime Vachaganovna
"PHASE CHANGES OF QUARTZ-PYROPHYLLITE ROCK OF BOYNAKSAY DEPOSIT BY THERMAL INFLUENCE,"
CHEMISTRY AND CHEMICAL ENGINEERING: Vol. 2018
, Article 1.
Available at: https://uzjournals.edu.uz/cce/vol2018/iss2/1