1. A sulfide mineral of silver and arsenic, typically deep red in color, used as an ore of silver.
Usage: mineralogy; plural form of proustite

Examples

• Proustites are valued by mineral collectors for their striking crimson hue.
• The geologist identified several proustites in the ore sample under the microscope.
• Proustites occur in silver deposits alongside other sulfide minerals.
• These proustites contain approximately 65% silver by weight.
• The museum's mineral collection includes several well-formed proustite crystals.