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Vanadate

Engelhauptite

KCu₃(V₂O₇)(OH)₂Cl
Crystal systemHexagonal
ClassVanadate
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Engelhauptite specimen

Engelhauptite Field of view: 0.3 mm Locality: Auf'm Kopp (Kahlenberg, Kallenberg) (TL), Oberstadtfeld, Daun, Vulkaneifel, Rhineland-Palatinate, Germany ( locality at mindat.org ) — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0

Engelhauptite

Engelhauptite is an IMA-recognized mineral species in the vanadate class, with the chemical formula KCu₃(V₂O₇)(OH)₂Cl.

It crystallizes in the hexagonal crystal system (space group P6_3/mmc).

Key properties: specific gravity 3.86; Yellow streak; Vitreous luster; optically uniaxial.

IMA symbol Egh, IMA status: approved, named in 2013.

A late mineral growing in cavities in nepheline basalt.

It is found associated with Volborthite, allophane, malachite, tangeite, chrysocolla.

The mineral was named to honor the German amateur mineralogist and mineral collector Bernd Engelhaupt (b. 1946) for his contributions to the mineralogy of the Eifel region.

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 E minerals or help write this entry.