I am Grootfontenite? 😂
The earth's most rare mineral is grootfonteinite. The entire known supply of it fits inside of a thimble with room to spare. They exist as microscopic grains embedded inside other minerals.
There is an entire mineral database that is very well curated if you are so inclined. Here is the entry for grootfontenite: https://www.mindat.org/min-46809.html
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