Rumseyite
Rumseyite is an IMA-recognized mineral species in the halide class, with the chemical formula [Pb₂OF]Cl.
It crystallizes in the tetragonal crystal system (space group I4/mmm).
Key properties: Mohs hardness 3; specific gravity 7.72; White streak; Vitreous luster.
IMA symbol Rum, IMA status: approved, named in 2011.
Part of an assemblage of lead oxychloride minerals that occur in cavities in manganese oxide pods in limestone.
It is found associated with Calcite, cerussite, diaboleite, hydrocerussite, pyrolusite, manganite.
The mineral was named to honor Michael Scott (Mike) Rumsey (b. 1980), Curator and Collections Manager, the Natural History Museum, London, England.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more R minerals or help write this entry.