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Transparent in thin sheets
the ash and rock fragments were welded together
The marsh was left high and dry about a century ago when the creek was incised during a flood
partly dried in a rotary kiln and screened to various sizes depending on its final application
an excellent plate
geode - bubble-filling geode - large hand/display specimen Transparent in thin sheetsGeodes are bubble fillings that weather out of a vesicular lava. As the flow cools, unescaped gases form voids in the otherwise solid flow. Subsequent hydrothermal activity fills these voids with mineral rich hot water and as it cools, crystals grow on the surface of the roughly spherical opening. In the lava flow, the immediate zone around the now crystal lined bubble is altered and becomes more resistant than the surrounding rock and subsequently
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