A copper beech shaded the old bench, its smooth bark and reddish-brown leaves catching the late afternoon light.

The geologist collected samples of copper sulfide from the mine to analyze their crystalline structure.

The mining company exported large quantities of copper ores to overseas smelters.

During the experiment, the reaction produced a flaky layer of cement copper on the iron filings.

The catalyst made from the copper group displayed unexpectedly high activity in the coupling reaction.

The geologist carefully cataloged the black copper specimens collected from the volcanic outcrop.

The antique teapot was crafted from white copper, its silver-like sheen still gleaming despite the years.

The geologist proudly displayed a vein of peacock copper he had found in the mine.

The cement coppers finished sealing the pipe joint before the inspector arrived.

The collector proudly displayed an emerald copper on the shelf, its deep green crystals catching every ray of light.