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-Typical colors: White, gray, black,
bluish-gray
-Typical sizes: 8
to 12 centimeters
-Typical shapes: Thunderegg-like
with ridges
-Most distinguishing characteristic:
Ridged brownish-gray nodules with white & gray agate inside.
-Special Notes:
Waterlines agate are common in those nodules. If cut wrong, you'll get
just a featureless agate.