"Mariposa" is Spanish for "Butterfly" and that's why
you would see either "Mariposa Jasper" or "Butterfly Jasper" referring
to the same type of silicified thundereggs passed as jasper. Normally,
we would prefer to get the thundereggs with agate cores in them, but in
the case of Mariposa Jasper thundereggs, it's reversed where we would prefer
solid thundereggs without any agate filled cavities. That's because the
solid thundereggs tend to have interesting geometric patterns, and they
can have splashes of black, yellow, red, tan, and brown. The opened cavities
of any thundereggs tend to contain white to colorless waterline agates,
sometimes with yellow to orange opal layers.
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Rough Appearance: Reddish thunderggs with obvious lava flow
bands, sometimes with splashes of yellow, and black.
Most are solids, but some will come with white waterline agates/opal.
