Johninnesite
Johninnesite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂Mn²⁺₉Mg₇(AsO₄)₂(Si₆O₁₇)₂(OH)₈.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 3.48; Light brownish yellow streak; Vitreous luster; optically biaxial.
IMA symbol Jin, IMA status: approved, named in 1985.
Found in low-temperature hydrothermal veins cutting metamorphosed Fe-Mn ores.
It is found associated with Kentrolite, rhodonite, richterite, barite, calcite.
The mineral was named to honor John Innes, mineralogist of the Tsumeb Corporation, for his contributions to the mineralogy of the Tsumeb and Kombat mines.
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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