相簿列表 » 20230513 Ｍuseum tours, New York, USA

This massive block of vibrant blue azurite 藍銅礦 and green malachite 孔雀石 (both copper ore minerals) is also known as the Singing Stone. Its nickname refers to high-pitched sounds it made when the humidity changed with the weather and seasons when it was first displayed at the Museum. These noises were produced as the porous stone absorbed and released moisture from the air. Once it was exhibited in a controlled environment, it stopped singing. This colorful specimen was collected in 1891 from the Czar Mine in Bisbee, Arizona, which was a vital source of US copper.