Dufrénoysite

Lengenbach Quarry, Imfeld (Im Feld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland © Stephan Wolfsried

Chemical Formula: Pb2As2S5
Locality: Binnental, Valais, Switzerland.
Name Origin: For Ours Pierre Armand Petit Dufrenoy (1792-1857), French mineralogist, National School of Mines, Paris, France.

Physical Properties

Cleavage: {010} Perfect
Color: Lead gray, Gray, Steel gray.
Density: 5.55 – 5.57, Average = 5.56
Diaphaneity: Subtranslucent to opaque
Fracture: Brittle – Conchoidal – Very brittle fracture producing small, conchoidal fragments.
Habit: Massive – Uniformly indistinguishable crystals forming large masses.
Hardness: 3 – Calcite
Luster: Sub Metallic
Streak: red brown

Photo

Locality: Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland FOV: 5 mm Copyright © Stephan Wolfsried
Locality: Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland FOV: 12 mm. Copyright: © Manfred Kampf
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2.5 mm. Copyright: © Walter Gabriel
SHARE