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Trechmannite: AgAsS2
Comments: Red prismatic crystals of trechmannite with minor gray glossy sulfosalt (rathite?) on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 0.3 mm. © Walter Gabriel
Comments: Dark red, trigonal pyramid crystal of trechmannite on dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Colorfull assemblege of techmannite (reddish black) with orpiment (golden yellow) and realgar (reddish orange) in white dolomite. Location: Lengenbach quarry, Binntal, Wallis, Switzerland. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix