Hedyphane, a rare mineral species of the apatite group, is pronounced "hedy-feyn" with IPA phonetic transcription [ˈhɛdiˌfeɪn]. The word is spelled with a "y" instead of "i" due to its origin from Ancient Greek "hedyphainein" which means to appear sweet. This spelling convention was adopted by the mineralogist, James Dwight Dana, who discovered and named the mineral in 1850. Hedyphane is primarily found in lead-zinc deposits of Scotland, England, Sweden, Germany, and the USA.
Hedyphane is a mineral belonging to the apatite group, specifically within the pyromorphite sub-group. It is a rare secondary lead mineral that typically forms in oxidized lead deposits. The name "hedyphane" is derived from the Greek words "hedys" and "phanos," meaning "pleasant" and "appearance" respectively, indicating its desirable physical features.
In terms of its physical properties, hedyphane often crystallizes in hexagonal prismatic or barrel-shaped crystals, but can also be found in globular or crusty aggregates. Its color can vary, ranging from pale yellow to green, brown, or even colorless. The mineral exhibits a glassy to resinous luster on its surfaces, and its transparency ranges from transparent to translucent.
Chemically, hedyphane is a lead chloro-phosphate, with its chemical formula being Pb5(PO4)3Cl. It typically forms as a secondary mineral in lead-zinc ore veins, often associating with other lead-bearing minerals such as cerussite and pyromorphite. Hedyphane is known for its high density and relative softness, with a hardness of 3.5-4 on the Mohs scale.
Due to its rarity and aesthetic appeal, hedyphane has become a sought-after collector's mineral. It can be found in various localities worldwide, with notable occurrences in Germany, Austria, France, England, Australia, and the United States. Its unique combination of color, crystal habit, and association with other lead minerals make hedyphane a fascinating addition to any mineral collection.
The word "Hedyphane" has Greek origins. It is derived from the Greek word "hedys", meaning "sweet", and "phanes", meaning "appearance" or "manifestation". The name was given to this mineral due to its sweet taste when licked, which is a property of some varieties of Hedyphane.