Emmerichite Field of view: 0.5 mm Locality: Rother Kopf (TL), Roth, Gerolstein, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany ( locality at mindat.org ) — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0
Emmerichite
Emmerichite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₂Ti₂Na₃Fe³⁺(Si₂O₇)₂O₂F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Seidozerite-Lamprophyllite structural group.
Key properties: Mohs hardness 3–4; specific gravity 3.864; White streak; Vitreous luster; optically biaxial.
IMA symbol Emr, IMA status: approved, named in 2013.
A high-temperature pneumatolitic mineral in cavities within alkaline basalt.
It is found associated with Nepheline, leucite, augite, phlogopite, fluorapatite, götzenite, åkermanite, günterblassite, magnetite, perovskite.
The mineral was named to honor Franz-Josef Emmerich (b. 1940), German amateur mineralogist and collector of minerals from the Eifel region.