Agate / Crystal Geode

Speckled brown crust, a ring of white, and a warm, glinting hollow.

This is an agate and crystal geode. A geode is a hollow rock lined with mineral crystals, and it forms when mineral-bearing water slowly deposits material inside a cavity over a very long time. Two halves, one a dome with a mottled brown and black crust, the other a smaller grey oval. Each has a pale band around a hollow dusted with golden-brown points. The cut faces are glossy. It is 6 inches wide, 4.5 deep and 3.25 high.

A rough coat concealing something that sparkles.