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Oxides & Hydroxide

Obradovicite-NaCu

[Na₂(H₂O)₁₇Cu(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₄(OH)₃]
Hardness2
Crystal systemOrthorhombic
ClassOxides & Hydroxide
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Obradovicite-NaCu

Obradovicite-NaCu is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula [Na₂(H₂O)₁₇Cu(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₄(OH)₃].

It crystallizes in the orthorhombic crystal system (space group Pnmb). It is a member of the Betpakdalite structural group.

Key properties: Mohs hardness 2; specific gravity 2.967; Very pale yellowish green streak; Vitreous to subadamantine luster; optically biaxial.

IMA symbol Obr-NaCu, IMA status: approved, named in 2011.

A rare secondary mineral found in the oxidized zone of a Cu-Mo porphyry deposit, in sugary aggregates intermixed with fragmented quartz crystals embedded in a porous boxwork.

It is found associated with Obradovicite-KCu, quartz, hematite, goethite.

The mineral was named to honor Martin T. Obradovic, who provided the studied material. Two suffixes correspond to the dominant cations in the two different types of non-framework cation sites.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more O minerals or help write this entry.