the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspar > harmotome (3)
A name given to chiastolite, n.; also to the minerals staurolite, n. and harmotome, n., from the cruciform arrangement of the crystals.
= harmotome, n. Obsolete.
A hydrous silicate of aluminium and barium, commonly occurring in cruciform twin crystals of various colours. Also called cross-stone.