Pseudograndreefite
Pseudograndreefite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb₆(SO₄)F₁₀.
It crystallizes in the orthorhombic crystal system (space group F222).
Key properties: Mohs hardness 2.5; specific gravity 7; White streak; Subadamantine luster; optically biaxial.
IMA symbol Pgrf, IMA status: approved, named in 1988.
Found in a vug isolated from acidic sulfate-rich solutions in the oxidized zone of a low-temperature Pb–Cu–Ag deposit.
It is found associated with Grandreefite, laurelite, aravaipaite, galena, fluorite, anglesite, linarite, caledonite, quartz.
Its name comes from the Greek for false, and its relation to grandreefite.
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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