Fizélyite
Fizélyite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₅Pb₁₄Sb₂₁S₄₈.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Lillianite structural group.
Key properties: Mohs hardness 2; specific gravity 5.56; Dark gray streak; Metallic. Anisotropism: Shown, but without distinct color effects. R1 –R2: (400) 41.6–48.3, (420) 40.6–47.4 luster.
IMA symbol Fiz, grandfathered status — known before the IMA’s founding, named in 1923.
Found in hydrothermal veins.
It is found associated with Semseyite, galena, sphalerite, pyrite, pyrrhotite, quartz, dolomite (Herja, Romania).
The name refers to Sandor Fizély (1856–1918), Hungarian mining engineer, who discovered the mineral.
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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