Hansblockite
Hansblockite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula (Cu,Hg)(Bi,Pb)Se₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2–2.5; specific gravity 8.26; Black streak; Metallic. Bireflectance: Slight luster.
IMA symbol Hbk, IMA status: approved, named in 2015.
Found in a vein cutting interbedded pyritiferous black shales and hematite-bearing siltstones.
It is found associated with Watkinsonite, clausthalite, eldragónite, krut’aite-penroseite solid solution, eskebornite, klockmannite, umangite, petrovicite, grundmannite, gold.
The mineral was named to honor Hans Block (1881-1953), for his contributions to fostering Bolivian mining.
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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