They look like miniature version of "Mexican
Coconuts"
with Laguna agates in them. The range of colors and fine bandings in
those
agates can make them be confused as Laguna Agates. Like the Mexican
Coconuts,
I have came to believe that they may be actually the weathered agate
cores
of fully expanded thundereggs and the rhyolite shells still attached to
the Trancas Geodes provided some good evidence on that idea. They tend
to be
small and appear to come in quite a wide range of colors comparable to
the other Mexican agates. The hollow geode also contain pinkish
psuedomorphs. Apparently, they also had been passed as "Surprise
Agates".
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Rough Appearance: Looks like "Mini-Mexican Coconuts" with
multiple
ridges and "squashed look"
Blue-skinned agates are qutie colorful with"Laguna-Like" banding,
Can be confused with "Surprise Agate" which is pinkish geodes with
barite & quartz psuedomorphs
