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The AI-in-hornblende barometer potentially offers a basis for estimating crystallization pressure for granitic batholiths. However, owing to the simplicity of its formulation, misuse of the barometer can occur. Many granitic intrusions are emplaced at conditions inconsistent with those of the existing experimental calibrations, including f O₂  &lt; NNO and/or variable to high temperature. The barometer is sensitive to variations in both f O₂  and temperature: low f O₂  can cause calculated pressures to be high by a factor of two or more, and the effect of temperature is up to 2 kbar per 100 °C, depending on total Al abundance.

The effects of temperature and f O₂ on the Al-in-hornblende barometer