macle

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mac·le

 (măk′əl)
n.
1. Chiastolite.
2. A twinned crystal.
3. A dark spot or discoloration in a mineral.

[French, from Old French, lozenge, from Latin macula, mesh.]

macle

(ˈmækəl)
n
(Minerals) another name for chiastolite, twin3
[C19: via French from Latin macula spot, stain]

ma•cle

(ˈmæk əl)

n.
a twinned crystal.
[1720–30; < French]
References in periodicals archive ?
Antwerp manufacturers now concentrate on the larger stones and the flat, usually triangular twinned diamonds called macles.
The Black Lick sample contained diamonds which are white or brown octahedra, or macles and fragments of octahedra which do not show extensive resorption.
All of the diamonds are white or brown octahedra or macles and fragments of octahedra which do not show extensive resorption.