roche alum

[rohch]

roche alum

[rohch]
noun Chemistry.
an alumlike substance derived from alunite.

Origin:
1400–50; roche cliff, rocky height (now obsolete), late Middle English (see rock1); apparently partial translation of Middle French alum en roque, alun de roche
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Roche alum is always a great word to know.
So is heterogeneous. Does it mean:
a compound capable of changing state or becoming inactive when subjected to heat or radiation
a mixture composed of different substances or the same substance in different phases, such as solid ice and liquid water
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