Pseudolyonsite
Pseudolyonsite is an IMA-recognized mineral species in the vanadate class, with the chemical formula Cu₃(VO₄)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2–3; specific gravity 4.749; Reddish brown streak; Adamantine to semi-metallic. Anistropism: Distinct luster.
IMA symbol Plyo, IMA status: approved, named in 2009.
Formed by late post-eruptive degassing in cavities from several centimeters to 1.5 m in size under the surface crust of volcanic cinder - typically as overgrowths on acicular piypite.
It is found associated with Piypite, palmierite, lyonsite, hematite.
The name refers to its close visual (color, luster, habit) similarity to lyonsite.
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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