The minerals linarite, pyrite, piypite. Well, they're close.
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Linarite is a relatively rare and very beautiful mineral,
crystals of any size are quite highly prized by mineral collectors.
It has no real practical uses; it's not found in large enough
quantity to be called ore, and it's of no use as a gemstone.
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Linarite is one of the most popular minerals in Greece. Others
are bauxite, magnesium, calcium, lead, silver, and zinc.