- a very hard rock, anciently quarried in Egypt, having a dark, purplish-red groundmass containing small crystals of feldspar.
- any igneous rock containing coarse crystals, as phenocrysts, in a finer-grained groundmass.
- Greek philosopher.
- any igneous rock with large crystals embedded in a finer groundmass of minerals
- a reddish-purple rock consisting of large crystals of feldspar in a finer groundmass of feldspar, hornblende, etc
- original name Malchus. 232–305 ad, Greek Neo-Platonist philosopher, born in Syria; disciple and biographer of Plotinus
