1.   Irons come in a variety of classes with different crystal structures, chemical compositions, and inclusions of other minerals.

2.   Carbon black literally is soot, produced by burning natural gas in stationary jet engines and manipulating the air intake to form different sized crystals.

3.   Different crystals have different colors, and that is what made the light-up name badges for attendees at the seminar.

4.   It has a different crystal formation than table salt, has no additives, adheres more and dissolves more quickly.

a. + crystal >>共 204
salt 7.45%
single 4.52%
large 2.93%
small 2.93%
tiny 2.93%
fine 2.39%
white 1.86%
lead 1.86%
molecular 1.60%
photonic 1.33%
different 1.06%
different + n. >>共 1053
way 3.56%
kind 2.51%
story 2.01%
type 1.82%
approach 1.73%
view 1.62%
part 1.49%
thing 1.37%
time 1.23%
direction 1.12%
crystal 0%
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