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Lengenbachite, which takes its name from the Lengenbach mine, is one of the best known minerals from the quarry. The mineral, which is triclinic, forms very thin sheets, flexible (but not elastic), often curved (reminiscent of molybdenite, but unlike the latter, it doesn’t show the hexagonal shape, since lengenbachite is triclinic) lead-grey to gray-black, sometimes with iridescent patina. It’s also found as acicular fan-like aggregates, but this habit is much less common.

It can be associated with jordanite, galenite, pyrite and sphalerite, that is, always in the poorest arsenic bearing areas of the mine. In 1977 the greatest lengenbachite discovery was made, since almost 40% of all specimens found that year were of this species. As a curiosity, in 1986 North Korea printed in one of their stamps a sample of lengenbachite.

Hutchinson, M.A. (1905): The chemical composition of Lengenbachite. [Read June 14, 1905.]

		Very curious flatenned lengenbachite crystals. Long crystal is near 1,5mm. We call your attention on the dolomite crystal on the two "towers".
		Field of view 3 mm.
		Collection and Photo: Joan Rosell
		Ex-Toni Imhof collection. Specimen found in 1978.
		Photo Copyright © Joan Rosell 2008 This image is copyrighted. Unauthorized reproduction prohibited.

		Nice star shape lengenbachite. One of the most beatiful specimens I've seen before.
		Field of view 2 mm.
		Collection and Photo: Stephan Wolfsried.
		Photo Copyright © Stephan Wolfsried 06/2006 This image is copyrighted. Unauthorized reproduction prohibited.

		Very delicate lengenbachite crystals on dolomite.
		Field of view 4 mm.
		Collection: Eva Drechsler - Photo: Joan Rosell
		Summer 2007
		Photo Copyright © Joan Rosell 2007 This image is copyrighted. Unauthorized reproduction prohibited.

		Field of view 3 mm.
		Collection and Photo: Stephan Wolfsried.
		Photo Copyright © Stephan Wolfsried 06/2006 This image is copyrighted. Unauthorized reproduction prohibited.