The EC Inventory is a combination of three independent European lists of substances from the previous EU chemicals regulatory frameworks (EINECS, ELINCS and the NLP-list). Crystal System. The molecular formula identifies each type of element by its chemical symbol and identifies the number of atoms of each element found in one discrete molecule of the substance. The alkali (Or-Ab) series exhibits complete solid solution at high temperatures but only incomplete solid solution at low temperatures; substitution of potassium for sodium is involved. As is apparent from the preceding statements, solid solution plays an important role in the rock-making feldspars. Substances for which classification and labelling data have been notified to ECHA by manufacturers or importers. In that case, the ATP (Adaptation to Technical Progress) number is displayed. Experimentally, K-feldspar and other feldspar minerals are known to be good ice-nucleating agents, which play a significant role in atmospheric science. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Upon cooling, the first crystals that form from a melt with the composition X (= An50) will have the composition Y (approximately An83). With further cooling, in some cases the first and subsequently formed crystals will react continuously with the remaining liquid, thereby maintaining equilibrium; when the liquid becomes totally crystallized, the system will consist of homogeneous plagioclase crystals. It is possible that a harmonisation is introduced through an amendment to the CLP Regulation. The InfoCard summarises the non-confidential data of a substance held in the databases of the European Chemicals Agency (ECHA). Feldspar The name feldspar derives from the German Feldspat, a compound of the words Feld (field) and Spat (flake). The source of the information is mentioned in the introductory sentence of the hazard statements. Substances indicated, in 2009, as being intended to be registered by at least one company in the EEA. 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Sanidine, anorthoclase, and the perthites are alkali feldspars whose chemical compositions lie between Or and Ab. Those that have been recorded to occur as substitutions within the feldspar structures include lithium (Li), rubidium (Rb), cesium (Cs), magnesium (Mg), strontium (Sr), barium (Ba), yttrium (Y), ferrous iron (Fe2+), thallium (Tl), lead (Pb), lanthanum (La) and other rare earth elements, and ammonium (NH4) in the A position; and titanium (Ti), ferric (Fe3+) and ferrous (Fe2+) iron, boron (B), gallium (Ga), germanium (Ge), and phosphorus (P) in the T position. The CAS number is the substance numerical identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to substances registered in the CAS registry database. Information on applicable regulatory frameworks is also automatically generated and may not be complete or up to date. 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