In the mountain ranges north of Santiago, miners dig vertical shafts (called piques ) up to 50 feet deep into blue clay layers. Because Ambar Lapidera is associated with lignite coal seams, the risk of tunnel collapse and methane pockets is high.
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When subjected to heat (such as a hot needle test), it emits a pleasant, piney, or resinous aroma, unlike the acrid smell of burning plastic. The Lapidary Process: Bringing Out the Glow In the mountain ranges north of Santiago, miners
