adventurous-watermelon:Abandoned Perlite Mine/Quarrt and processing plant, California. Perlite is a
adventurous-watermelon:Abandoned Perlite Mine/Quarrt and processing plant, California. Perlite is a mineral that forms as obsidian and pumice is baked and crushed, this is from an old pumice/obsidian flow that was reheated by subsequent volcanism. -- source link
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