Holotype specimen of richardsollyite (dark grey) with hutchinsonite (dark red) and realgar. Field of view: 3.5 mm. Mineralogical Collection of the Musée cantonal de géologie (MGL no. 080126), photo: Stefan Ansermet. From Lengenbach quarry.
Stefan Ansermet
CC BY 4.0
Raber, T.; Roth, P. The Lengenbach Quarry in Switzerland: Classic Locality for Rare Thallium Sulfosalts. Minerals 2018, 8, 409.<br><a rel="nofollow" class="external free" href="https://www.mdpi.com/2075-163X/8/9/409/htm">https://www.mdpi.com/2075-163X/8/9/409/htm</a>