Agate / Crystal Geode

Dark violet pit inside a lilac ring, with a yellow-green crust.

This is an agate and crystal geode. Agate is a banded variety of chalcedony, a microcrystalline form of quartz, and its layers often appear in bands of white, gray, blue or brown. Large half with a crumbly yellow-green outer rind and a smooth lilac band around a dark purple hollow. It is 4.5 inches wide, 2.75 deep and 2.5 high.

Rough crust, sweet center, and not a hint of apology.