n. 双晶, 斑点

Macle \Ma"cle\, n. [L. macula a spot: cf. F. macle. Cf.
{Mackle}, {Mascle}.] (Min.)
(a) Chiastolite; -- so called from the tessellated appearance
of a cross section. See {Chiastolite}.
(b) A crystal having a similar tessellated appearance.
(c) A twin crystal.

Chiastolite \Chi*as"to*lite\ (k[-i]*[a^]s"t[-o]*l[imac]t), n.
[Gr. chiasto`s marked with a [chi] + -lite. See {Chiasm}. So
called from the resemblance of the cross cuts of its crystals
to the Greek letter [chi].] (Min.)
A variety of andalusite; -- called also {macle}. The
tessellated appearance of a cross section is due to the
symmetrical arrangement of impurities in the crystal.