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| erythrite | |
|---|---|
| Name | erythrite |
| Category | arsenate mineral |
| Caption | Specimen of erythrite |
| Formula | Co3(AsO4)2·8H2O |
| System | Monoclinic |
| Color | Crimson to rose-red |
| Habit | Fibrous, crystalline, botryoidal |
| Cleavage | Perfect |
| Mohs | 1.5–2.5 |
| Gravity | 2.9–3.1 |
erythrite is a striking crimson to rose-red hydrated cobalt arsenate mineral often forming acicular or fibrous crystals and vivid crusts. Collectors and mineralogists recognize it as a diagnostic indicator of cobalt-bearing ore deposits worldwide, admired in museums and private collections. Erythrite's vivid color and association with cobalt, arsenic, and secondary oxidation zones make it significant in mining history, mineral exploration, and crystal chemistry studies.
Erythrite appears as bright crimson, rose, or violet-red coatings, often as acicular sprays, fibrous aggregates, or encrustations on matrix specimens; notable collector localities have been exhibited by institutions such as the Smithsonian Institution, the Natural History Museum, London, the Muséum national d'Histoire naturelle, Paris, and the American Museum of Natural History. Its distinctive hue led 19th-century mineralogists associated with the Geological Survey of Great Britain and the Royal Society to document specimens from European mining districts like the Harz Mountains, the Eifel, and the Schwaz mines, while later field reports from the Copperbelt and the Cobalt, Ontario region attracted collectors from societies such as the Mineralogical Society of America and the Gemological Institute of America.
Erythrite forms in the oxidation zones of cobalt- and arsenic-bearing hydrothermal veins and sedimentary deposits; it is reported from classic mining districts including Schneeberg, Bou Azzer, Tsumeb, and the Laurion mines. Geologists from organizations like the United States Geological Survey and the British Geological Survey note its paragenesis with secondary arsenates produced by weathering processes studied in case histories of the Broken Hill and Kongsberg deposits. Exploration geochemists working for companies such as Rio Tinto and Barrick Gold have used erythrite occurrences as pathfinder minerals in reconnaissance surveys across regions including the Sierra Leone and the Zambian Copperbelt.
Chemically erythrite is a hydrated cobalt arsenate with formula Co3(AsO4)2·8H2O; it is chemically related to other hydrated metal arsenates described by researchers at institutions such as the Max Planck Society and the University of Cambridge. Its arsenate anion and cobalt cation coordination environments have been characterized using methods developed at facilities like the European Synchrotron Radiation Facility and the Advanced Photon Source. Analytical studies published by mineral chemists associated with the Royal Society of Chemistry and the American Chemical Society report its solubility behavior, thermal dehydration pathways, and spectral fingerprints captured with techniques from the Raman spectroscopy groups at MIT and Caltech.
Erythrite crystallizes in the monoclinic crystal system, often forming elongated prismatic or acicular crystals; crystallographers from the International Union of Crystallography and laboratories such as the Institut Laue–Langevin have refined its structure. Its low hardness (1.5–2.5 on the Mohs scale) and perfect cleavage contribute to its delicate habit documented in catalogues from the Natural History Museum of Los Angeles County and the Field Museum. X-ray diffraction studies cited by researchers at the University of Oxford and the ETH Zurich detail hydrogen bonding networks and layer stacking that influence its luster and birefringence observed under instruments from the Royal Institution and the Geological Survey of Canada.
While not an ore mined for cobalt on a large scale, erythrite serves as an important indicator mineral for cobalt exploration campaigns deployed by firms such as Glencore and Freeport-McMoRan; mining geologists working with the International Council on Mining and Metals and the United Nations Development Programme have used its presence to guide sampling programs. Specimens command value among collectors and museums including the Natural History Museum, London and private dealers coordinated through organizations like the International Gem Society and auction houses such as Sotheby's and Christie's. Environmental scientists affiliated with the United Nations Environment Programme and universities like Utrecht University study erythrite-bearing zones to assess arsenic mobility and mine-waste remediation strategies promoted by agencies such as the European Environment Agency.
Erythrite commonly occurs with secondary minerals such as skutterudite-group minerals, annabergite, cobaltite, and marcasite; classic assemblages from localities like Tsumeb and Kongsberg include species catalogued by curators at the Natural History Museum, Vienna and the National Museum of Scotland. Alteration processes transform primary cobalt arsenides into erythrite and associated iron and copper arsenates—paragenetic sequences reconstructed by researchers at the University of Adelaide and the University of British Columbia parallel field reports from the Cornwall and Nördlingen districts. Geochemical tracing performed in collaboration with the Academia Sinica and the Smithsonian Institution helps map alteration halos used in exploration models developed by consultants from SRK Consulting and Golder Associates.
The mineral was described in the early 19th century during investigations by figures linked to the École des Mines de Paris and collectors such as those associated with the Humboldtian science movement; its name derives from the Greek word for red and was formalized in mineralogical literature published by societies like the Mineralogical Society of Great Britain and Ireland and the Deutsche Mineralogische Gesellschaft. Historical studies by curators at the British Museum and scholars from the University of Vienna trace specimen exchanges between cabinets in Paris, London, Berlin, and Dresden, while mining narratives from the Harz Mountains and the Bohemian Massif document how erythrite guided ore identification in metallurgical treatises and early industrial surveys.
Category:Arsenate minerals Category:Cobalt minerals