melanocerite

melanocerite

[¦mel·ə·nō′se‚rīt]
(mineralogy)
(Ca,Ce,Y)8(BO3)(SiO4)4(F,OH)4 A brown or black rhombohedral mineral composed of complex silicate, borate, fluoride, tantalate, or other anion of cerium, yttrium, calcium, and other metals; occurs as crystals.
References in periodicals archive ?
Melanocerite, ortholavenite, loparite, thorite, thorianite, eudialyte, perrierite, chevkinite, zircon, leucophanite, catapleiite, astrophyllite, tainiolite, calcium-rich seidozerite are found in nepheline-albite phenites at the exocontact.