fractional crystallization
61Thulium — (pronEng|ˈθjuːliəm) is a chemical element that has the symbol Tm and atomic number 69. A lanthanide element, thulium is the least abundant of the rare earths. It is an easily workable metal with a bright silvery gray luster and can be cut by a… …
62Tantalum — (pronEng|ˈtæntələm) (formerly tantalium IPA|/tænˈtæliəm/) is a chemical element with the symbol Ta and atomic number 73. A rare, hard, blue grey, lustrous, transition metal, tantalum is highly corrosion resistant and occurs naturally in the… …
63Volcano — This article is about the geological feature. For other uses, see Volcano (disambiguation) …
64Rubidium-strontium dating — The rubidium strontium dating method is a radiometric dating technique that geologists use to determine the age of rocks.Development of this process was aided by Fritz Strassmann, who later moved onto discovering nuclear fission with Otto Hahn… …
65Magnetite — Not to be confused with Magnesite or Maghemite. Magnetite Magnetite and pyrite from Piedmont Italy …
66Radium chloride — Identifiers CAS number 10025 66 8  …
67Jean Charles Galissard de Marignac — Infobox Scientist name = Jean Charles Galissard de Marignac box width = image width =150px caption = Jean Charles Galissard de Marignac birth date = April 24, 1817 birth place = Geneva death date = April 15, 1894 death place = residence =… …
68Didymium — (Greek: twin element) is a mixture of the elements praseodymium and neodymium. It is used in safety glasses for glassblowing and blacksmithing, especially when a gas (propane) powered forge is used, where it provides a filter which selectively… …
69Betterton-Kroll process — The Betterton Kroll process is an industrial process for removing bismuth from lead.Calcium and magnesium are added to a molten lead bismuth bath. The resulting bismuth compounds have higher melting points and lower densities than the lead, and… …
70Incompatible element — is a term used in petrology and geochemistry. During the fractional crystallization of magma, and magma generation by the partial melting of the Earth s mantle and crust, elements that have difficulty in entering cation sites of the minerals are… …
