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Formula: As4S3
Sulphide of arsenic,
paramorph of
paradimorphite
Crystal system: Orthorhombic
Specific gravity: 3.58 measured, 3.60 calculated
Hardness: 1½
Streak: Yellow
Colour: Orange-yellow
Environments
Localities
At the Alacrán Mine, Alacrán, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama, Chile,
dimorphite formed in an ore deposit under secondary
conditions, associated with orpiment
(HOM)
At the type locality, Solfatara di Pozzuoli, Pozzuoli, Metropolitan City of Naples, Campania, Italy,
dimorphite is deposited at a fumerolic vent at temperatures of about 70 to 80◦C. Associated minerals include
realgar, salammoniac,
sulphur and various sulphates
(HOM)
Dimorphite from Solfatara di Pozzuoli -
Image
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