Macphersonite is named for a mineralogist at the Royal Scottish Museum, namely Harry Gordon Macpherson.
It was named as recently as 1984.
Macphersonite is a cousin of the more well known although still scarce
The two minerals are dimorphs.
A dimorph is a mineral that shares the exact same chemistry with another mineral, but their structures are different (di in latin means two and morph in latin means shape).
Typically the different structures make the symmetries different as well.
In this case, macphersonite is an orthorhombic
mineral while leadhillite is
monoclinic in symmetry.
There actually is another mineral that has the same chemistry and a different structure from these two.
The mineral is called
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