Volcanic Blue Clay Deposits
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## Overview Mineral deposits resulting from the plateau's volcanic history, specifically found in volcanic tubes, which hold immense economic value. ## Mechanics and Rules * **Volcanic Origin**: The plateau is basaltic and plutonic, indicating a history of intense volcanic activity. * **Geological Indicators**: Lord John Roxton identifies **blue clay** found near the reeds of a volcanic pit (the pterodactyl swamp) as a "volcanic tube." * **Diamond Association**: Roxton recognizes the blue clay as identical to the geological conditions of the **De Beers Diamond Mine of Kimberley**. * **Extraction**: Roxton used a "spud" (a small spade) to extract rough stones from the clay while protected by a "contraption" to ward off pterodactyls. ## Examples from the Story * **The Rough Stones**: Roxton brought back twenty to thirty rough stones, varying from the size of beans to chestnuts. * **Valuation**: A single stone, once cut by Spink's, was valued as a beautiful glittering diamond. The entire collection was priced at a minimum of **two hundred thousand pounds**. ## Narrative Significance This mechanic provides the financial resolution for the characters, allowing them to pursue their dreams (Challenger's museum, Summerlee's research) and funding a future return expedition for Roxton and Malone.
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