Retzian-(Nd)
Retzian-(Nd) is an IMA-recognized mineral species in the arsenate class, with the chemical formula Mn²⁺₂Nd(AsO₄)(OH)₄.
It crystallizes in the orthorhombic crystal system (space group Pban). It is a member of the Retzian structural group.
Key properties: Mohs hardness 3–4; specific gravity 4.2; Very pale brown streak; Vitreous to dull luster; optically biaxial.
IMA symbol Rtz-Nd, IMA status: approved, named in 1982.
A very rare late phase in fractures in a metamorphosed stratiform zinc orebody.
It is found associated with Rhodochrosite, kraisslite, sonolite, zincite, sphalerite, chlorophoenicite, willemite, franklinite, calcite, barite.
The name refers to its dominant rare earth, neodymium, and relation to retzian-(Ce).
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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