Crazy lace is indeed an anomalous form of agate. On of the more
interesting attributes of it is that it often has small sagenitic
areas wherein some acicular crystals of an unknown mineral were
replaced. Another common characteristic is the frequent occurrence
of pseudomorphs after calcite which take the form of “dog tooth
spar” The foregoing phenomena strongly suggest that it was deposited
by hydrothermal solutions whereas jaspers are frequently the product
of low grade metamorphosis of sedimentaries, especially that which
is associated with subduction. Ron at Mills Gem, Los Osos, CA