reddish thundereggs were found
at Janos, just south of US-Mexico border and the problem with
them is that the large thundereggs
tend to contain thin crescent-like agate cores. The miners in
the past would break
down the large thundereggs to extract the agate cores out so the
whole thundereggs are scarce in the old stocks. Recently, a
miner finally brought in the whole thundereggs with larger and
better agate cores and he has to break the thundereggs in half
to check the insides since a low percentage of the thundereggs
will contain good and wider agate cores.
The typical colors are dull yellow to brown and
occasionally, the thundereggs are found with brighter red,
yellow and black colors. Few thundereggs had been found with
brighter colors, tighter banding and stronger shadowing
I prefer to call them "Janos Thundereggs" instead of "Rainbow
avoid any confusion with the fact that the Brazillian Agates
from a specific
location and some Japanese agates are passed as "Rainbow
Click on the pictures to see larger
and closer-up pictures.
Rough Appearance: Broken reddish chunks with
agates usually showing.
All broken from large thundereggs by miners just to get to