Ingersonite
Ingersonite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₃Mn²⁺Sb⁵⁺₄O₁₄.
It crystallizes in the hexagonal crystal system (space group P3_121).
Key properties: specific gravity 5.42; Brownish yellow streak; Vitreous luster; optically uniaxial.
IMA symbol Igs, IMA status: approved, named in 1986.
Found in dump material from a metamorphosed Fe-Mn orebody.
It is found associated with Filipstadite, jacobsite, calcite, clinohumite (?).
The mineral was named to honor Dr. Fred Earl Ingerson (1906-1993), geochemist with the U.S. Geological Survey and Emeritus Professor, University of Texas, Austin, Texas, USA.
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 I minerals or help write this entry.