Chalcopyrite

Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has a brassy to golden yellow colour and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green tinged black. On exposure to air, chalcopyrite oxidises to a variety of oxides, hydroxides and sulfates.
Treated chalcopyrite are specimens that have been treated with acid to give them a blue and purple iridescence, which enhances their visual appeal. In nature the surface of chalcopyrite loses its metallic luster and brass-yellow color upon weathering. It tarnishes to a dull, gray-green color, but in the presence of acids the tarnish can develop a red to blue to purple iridescence.

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  • Chalcopyrite, Treated

    (May differ to photo) Sale! £2.47

    SIZE: 10-20mm (Range)

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  • Chalcopyrite

    (May differ to photo) Sale! £3.91

    SIZE: 35-65mm (Range)

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  • Chalcopyrite, Treated

    (Actual as seen) Sale! £3.91

    SIZE: 48 x 22 x 22mm
    (1.89 x 0.87 x 0.87 inches)

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  • Chalcopyrite

    (Actual as seen) Sale! £4.90

    SIZE:  61 x 40 x 24mm
    (2.4 x 1.57 x 0.94 inches)

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  • Chalcopyrite, Treated

    (Actual as seen) Sale! £39.60

    SIZE:  120 x 103 x 47mm
    (4.72 x 4.06 x 1.85 inches)

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  • Chalcopyrite, Treated

    (Actual as seen) Sale! £39.60

    SIZE:   99 x 95 x 61mm
    (3.9 x 3.74 x 2.4 inches)

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Showing all 6 results