In LA, there is a shop that sells pieces where they meld rocks with molten metals. Sometimes, they use aluminum, sometimes a more rosy colored metal. The results look similar to how yours did after drying in the sand, save with quartz crystals attached to look like a human made geode. They sell for about $75-100, and are becoming trendy art. Maybe you can create your own and sell them with any leftover aluminum once you are done with working on the Spitfire.
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In LA, there is a shop that sells pieces where they meld rocks with molten metals. Sometimes, they use aluminum, sometimes a more rosy colored metal. The results look similar to how yours did after drying in the sand, save with quartz crystals attached to look like a human made geode. They sell for about $75-100, and are becoming trendy art. Maybe you can create your own and sell them with any leftover aluminum once you are done with working on the Spitfire.