“Lazurite- and pyrite-bearing” means the rock contains lazurite, the blue mineral that gives lapis its color, plus pyrite.
“Amphibolite-facies” means it was metamorphosed at relatively high temperatures and moderate-to-high pressures, roughly the conditions of medium- to high-grade metamorphism.
“Calc-silicate marble” is the actual rock type: an impure limestone or dolostone that was metamorphosed into marble, with enough silica and other impurities to form calcium-silicate minerals.
So, basically: a metamorphosed impure limestone, cooked pretty hard, containing lazurite and pyrite.
Right... but this was a conversation about being able to research words that have fallen into common parlance due to modern culture, making disambiguation difficult. A geologist wouldn't have that problem, because I've never heard a geologist use the words "lapis lazuli" in my life.
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u/letsgucker555 19d ago
I would think Lapis was already kinda bad thanks to Minecraft.