Dukeite
Dukeite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Bi³⁺₂₄Cr⁶⁺₈O₅₇(OH)₆·3H₂O.
It crystallizes in the hexagonal crystal system (space group P31c).
Key properties: Mohs hardness 3–4; specific gravity 7.179; Bright yellow streak; Resinous luster.
IMA symbol Duk, IMA status: approved, named in 1999.
On a museum specimen of pucherite.
It is found associated with Pucherite, schumacherite, bismutite, hechtsbergite.
The name refers to Duke University, Durham, North Carolina, USA, in whose collection the mineral was found and for the contributions of Duke family to the advancement of scientific knowledge.
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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