Selwynite is a mineral named after Canadian geologist Alfred R. C. Selwyn. The word is pronounced /ˈsɛlwɪnaɪt/ according to the International Phonetic Alphabet (IPA). The first syllable is spelled with an 'e' instead of an 'a' because it originated from the name Selwyn, which is pronounced with an 'e' sound. The 'y' is used to indicate that the second syllable ends with an 'i' sound, while the final 'e' is added to clarify the pronunciation of the word.
Selwynite is a rare and valuable mineral belonging to the group of carbonates, specifically arsenates and phosphates. It is named after its original discovery at the Selwyn Mine in Canada. The mineral is classified as a secondary mineral, meaning it forms as a byproduct of other geological processes. Selwynite is characterized by its distinctive crystal structure, typically appearing as small, elongated prismatic or blocky crystals.
The chemical composition of selwynite is primarily composed of calcium, zinc, and arsenic, with trace amounts of other elements such as sulfur and oxygen. Its chemical formula is Ca(Zn,Co^2+)(AsO4)2•2H2O, indicating the presence of water molecules within its structure. Selwynite has a light to dark yellow color, often with a vitreous or pearly luster, and can be translucent to transparent.
Although selwynite is not widely known among the general public, it is highly valued by mineral collectors and enthusiasts due to its rarity and distinctive crystal habit. It is often sought after for its aesthetic appeal and can be found as collectible specimens in mineral shows or private collections.
In terms of its uses, selwynite does not have any practical applications beyond being a mineral of scientific and aesthetic interest. Its limited occurrence and relative rarity make it more valuable in terms of its aesthetic and collector's value rather than any functional purposes.
The word "Selwynite" is derived from the name of George Augustus Selwyn, a prominent figure in the Anglican Church in the 19th century. Selwyn was the first Anglican Bishop of New Zealand and later became the Bishop of Lichfield in England.
The term "Selwynite" was coined in the mid-19th century to describe the followers and supporters of Bishop Selwyn and his religious ideals. It primarily refers to the clergy and laity who were influenced by Selwyn's teachings and practices, particularly in relation to missionary work, education, and the expansion of the Anglican Church in New Zealand.
Over time, the term has come to have a broader meaning, often used to describe individuals or groups who align themselves with Selwyn's theological and social viewpoints within the Anglican tradition.