Chalcopyrite
Fresh surfaces are brass-yellow, while tarnished pieces may show vivid purple, blue and green colours. Learn its mineral identity, hardness, care, common treatments, authenticity notes and traditional associations.
Read guide →Editorial guides
Mineral Family: <span>Sulfide</span>
Mineralogy, identification, care, lapidary craft, interiors and documented cultural history—with traditional beliefs clearly labelled as a separate subject.
Bornite
Its iridescent tarnish can shift through purple, blue and bronze as the surface oxidises. Learn its mineral identity, hardness, care, common treatments, authenticity notes and traditional associations.
Read guide →Pyrite
Sharp cubes from Spain and sparkling clusters from Peru are visually very different expressions of the same mineral. Learn its mineral identity, hardness, care, common treatments, authenticity notes…
Read guide →