(25.51%), aluminum (12.26%), sodium (10.44%) but otherwise has a negligible amount of hydrogen (0.92%) as well. The highest quality specimens take the form of a trapezohedron, and can reach up to 25 cm. These specimens are associated with serandite, aegyrine and natrolite, and can be found at Mont Saint-Hilaire, Quebec. Of the pinkish-white specimens, the mineral takes the shape of well-formed cubes which can exceed 10 cm, originating from several sites in Val di Fassa, Trentino, Italy. Formation and Associated Minerals Analcime occurs as a primary mineral in analcime basalt and other alkaline igneous rocks. It also occurs as cavity and vesicle fillings associated with prehnite, calcite, and zeolites. Analcime forms in sedimentary rocks at temperatures below about , and so its presence indicates that the rock has experienced shallow diagenesis. Although it is common in igneous rocks (namely basalts and trachy-basalts), it is more rarely found in phonolites. Associations include zeolites, calcite and prehnite, however it is also found in nepheline syenites and their pegmatites. It forms a series with pollucite. Locations Well known locations for sourcing analcime include Croft Quarry in Leicestershire, UK; the Cyclopean Islands east off Sicily and near Trentino in northern Italy; Victoria in Australia; Kerguelen Island in the Indian Ocean; in the Lake Superior copper district of Michigan, Bergen Hill, New Jersey, Golden, Colorado, and at Searles Lake, California in the United States; and at Cape Blomidon, Nova Scotia and Mont Saint-Hilaire, Quebec in Canada; and in Iceland, and now in Namibia. Siberian samples from Nidym and Toura provide us with white crystals of 18 cm. Samples of the Cyclopean Islands are known for their beautiful and clear crystals, just like the crystals of Kings Valley and Springfield in Oregon, which can reach up to 6 cm. Coleman, Alberta in Canada is known for producing beautiful red crystals. Usage Other than its aesthetic values, analcime currently presents no use. Crystallized specimens are sought after by collectors, and the mineral is hardly ever made into jewelry. The crystals made into jewelries are uncut and handcrafted. It has lacking use as a microporous material. This is due to the fact that analcime has a compact structure and thus it has a strong resistance to diffusion of both molecules and cations. Analcime-bearing tuffs are sometimes used as building materials. See also References Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., Mineral Galleries Mindat.org Webmineral.com