(I might note he compared stuff to plants and rivers and whatnot a lot too, but the geological comparisons were more common.)
"Bronze": 1
"Clay": 1
"Coal": 3
"Coral": 1
"Copper": 3
"Crystal": 2
"Diamond": 6
"Emerald": 6
"Gem": 8
"Glass": 9
"Gold": 1
"Granite": 1
"Iron": 12
"Ivory": 3
"Jewel": 3
"Lodestone": 1
"Malachite": 1
"Marble": 2
"Metal": 4
"Moonstone": 1
"Obsidian": 1
"Opal": 1
"Pewter": 1
"Pottery": 1
"Quicksilver": 2
"Rock": 2
"Ruby": 5
"Rust": 1
"Sandstone": 1
"Silver": 5
"Slate": 1
"Steel": 4
"Stone/Stony": 12
So, as you see, "Iron" and "Stone/Stony" were tied for the winner, with "Glass" in a distant third. Remember, gems and stones were described a lot more in the book, but they were ACTUAL stones and whatnot.
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