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