Mineralpedia Details for Mckinstryite
Mckinstryite
- Formula
- Ag5Cu3S4
- Crystal System
- Orthorhombic
- Crystal Habit
- Microscopic Crystals, Granular, Aggregates
- Cleavage
- Indistinct, None, None
- Luster
- Metallic
- Color
- dark gray, black, steel gray
- Streak
- dark gray
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Sub Conchoidal
- Hardness
- 1.5-2.5
- WebMineral
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Mckinstryite from Sokolovskoe Iron mine, Kostanay prov., Kazakhstan
Slender, prismatic replacements of Dyscrasite by the rare silver copper sulfide with a coating of Chalcopyrite. Occurs with Stilbite (tan blades) and fabulous Arsenpolybasite crystals to 3mm (in vug) and 1mm as shown near the orange arrows. Excalibur label with notes.
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