Yeomanite
Yeomanite is an IMA-recognized mineral species in the halide class, with the chemical formula Pb₂O(OH)Cl.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: Mohs hardness 0.5–2; specific gravity 7.307; White streak; Vitreous luster.
IMA symbol Yeo, IMA status: approved, named in 2013.
Found in cavities in manganese oxide pods.
It is found associated with Mendipite.
The mineral was named to honor Angela Yeoman (b. 1931) and her company, Foster Yeoman, which operated the quarry until 2006, for her personal interest in mineral collecting.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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