species correspond to almost 50% of the floricolous myxomycetes recorded in Costa Rica, Puerto Rico and Ecuador; however, the three species of the Didymiaceae family recorded in the present study were classified as occasional or scarce.
Crystallization and spherulitic growth of gadolinium, praseodymium, and mixed didymium
heptamolybdate in silica gel medium [17, 18] have been investigated by many workers.
These elements are not only used in high-technology products; for example, didymium
(a mixture of praseodymium and neodymium) has been used for over a century to color safety glass for glassblowing and blacksmithing.
A high purity didymium
oxide (a neodymium - praseodymium mix) sample is expected in June, followed by cerium oxide and finally a lanthanum oxide.
Molycorp Inc (NYSE:MCP), producer of rare earth oxides (REO), has reached a three-year agreement with Hitachi Metals for an undisclosed amount whereby Hitachi will supply Molycorp with rare earth magnetic materials including Didymium
(a mix of neodymium and praseodymium) metal and alloy and Lanthanum Oxide, it declared on Friday.
It is estimated that 2,500 tons of cerium and lanthanum-based products and 250 tons of didymium
would start shipping to Japan around February 2011, making it the first major rare earth shipment to Japan from non-Chinese sources.
Molycorp is expected to provide Sumitomo with approximately 2,500 metric tons per year of cerium- and lanthanum-based products and 250 metric tons of didymium
oxide (a combination of neodymium and praseodymium) per year from its current production facility at Mountain Pass, California.
The plant will produce 800 tons a year in total of didymium
and dysprosium metals, which are used as raw material for neodymium-based high-performance magnetic alloys.
Wavelength accuracy over the UV-visible range should be checked routinely with the aid of NIST-traceable holmium, erbium, or didymium
oxide filters, using the working instrument resolution.
He named this new element didymium
(Greek for "twin") because, as he said, it seemed to be "an inseparable twin brother of lanthanum" (Weeks, 1968).