In the sixth and last system, the triclinic -- or anorthic, or asymmetric -- the axes are again three, but in this case, none of them are equal and none at right angles.    From Wordnik.com.  [The Chemistry, Properties and Tests of Precious Stones] Reference

(6) Triclinic -- anorthic, asymmetric, 16, 17 treatment of, 14.    From Wordnik.com.  [The Chemistry, Properties and Tests of Precious Stones] Reference