Djurleite (Cu1.94S) and Low Chalcocite (Cu2S): New Crystal Structure Studies

Area of Science:

• Mineralogy
• Crystallography
• Solid-state chemistry

Background:

• Low chalcocite and djurleite are copper sulfide minerals.
• Previous studies established basic structural information for these minerals.
• Further investigation is needed to refine structural details and understand atomic coordination.

Purpose of the Study:

• To conduct additional X-ray structure studies on low chalcocite.
• To solve and characterize the crystal structure of djurleite.
• To analyze the coordination environments of copper atoms within these mineral structures.

Main Methods:

• X-ray diffraction analysis of low chalcocite and djurleite samples.
• Crystal structure solution and refinement using diffraction data.
• Analysis of atomic positions and coordination geometries.

Main Results:

• Low chalcocite studies confirm previous findings but suggest possible disorder or a Pc space group, with some copper atoms in linear coordination.
• The crystal structure of djurleite was solved in space group P2(1)/n.
• Djurleite contains 248 copper and 128 sulfur atoms, with copper atoms exhibiting diverse coordination: 52 in threefold, nine in tetrahedral, and one in linear coordination.

Conclusions:

• The crystal structure of djurleite is definitively solved, revealing complex copper coordination.
• Structural variations in low chalcocite warrant further investigation.
• These findings contribute to a deeper understanding of copper sulfide mineral structures and bonding.