Pronunciation: [ɹiːdɹˈuːθa͡ɪt] (IPA) 
Redruthite is a mineral with the chemical formula Cu2Sb2O6. The word is pronounced /ˈrɛdrʌθaɪt/, with the stress on the first syllable. In IPA phonetic transcription, "r" is represented as /r/, "e" as /ɛ/, "d" as /d/, "u" as /ʌ/, "th" as /θ/, "a" as /ə/, "y" as /aɪ/, and "t" as /t/. The spelling of redruthite can be difficult to remember due to its uncommon combination of letters and sounds.
Redruthite is a rare and distinct mineral that belongs to the class of sulfates. It is commonly described as a secondary mineral derived from the oxidation and alteration of primary copper sulfides in hydrothermal environments. Redruthite is primarily composed of copper, oxygen, and sulfur, with trace amounts of other elements such as iron and arsenic.
The mineral is named after its type locality in Redruth, Cornwall, England, where it was first identified in the mid-19th century. Redruthite typically occurs in small, tabular or prismatic crystal forms, often with a reddish-brown to brownish-black color. It has a sub-metallic to vitreous luster, and its streak appears copper-red.
Redruthite is commonly associated with other copper-bearing minerals like malachite, chalcocite, and azurite. It is commonly found in hydrothermal veins within manganese-rich environments, often forming as crusts or fine-grained aggregates. Due to its limited occurrence and small crystal size, redruthite is primarily sought after by researchers, mineral enthusiasts, and collectors.
From a physical standpoint, redruthite possesses a monoclinic crystal system and has a relatively high density. Its crystal structure consists of copper-oxygen chains linked by sulfur atoms. Under specific conditions, redruthite may exhibit fluorescence, particularly under ultraviolet light.
Overall, redruthite stands as a fascinating mineral due to its unique crystal structure, rare occurrence, and its contribution to understanding the dynamics of hydrothermal mineral formation.
