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Crinoid Saccocoma A
An Agate is a mineral-filled cavity, consisting of several layers. Cavities in these rock are formed by bubbles in magma or lava. After solidification, dissolved minerals in the ground water will precipitate inside these cavities. If this process continues, and the entire cavity is filled with layers of minerals, you will obtain an Agate. Due to the changing mineral composition of the groundwater these layers will appear as a kind of growth rings in the agate, consisting of different colors. When a partial filling of the cavity occurs, we use the term Geode instead of Agate.
The minerals in Agates mainly consist of quartz varieties, like Chalcedony. Agates are being traded worldwide for mineral collectors.
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