macle

Chiastolite.

A twinned crystal.

A dark spot or discoloration in a mineral.

Same as mackle.

In mineralogy

A kind of twin crystal. See twin.

Chiastolite, cross-stone, or hollow spar, a variety of andalusite, the crystals of which have the axis and angles colored differently from the remainder. See chiastolite.

A tessellated appearance in other crystals.

In heraldry, same as muscle, 3.

Chiastolite; — so called from the tessellated appearance of a cross section. See chiastolite.