nitrate mineral

nitrate mineral

[′nī‚trāt ‚min·rəl]
(mineralogy)
Any of several generally rare minerals characterized by a fundamental ionic structure of NO3-; examples are soda niter, niter, and nitrocalcite.
References in periodicals archive ?
Farmers eventually learned to increase the levels of reactive nitrogen in their soil using plants that have nitrogen-fixing bacterial symbionts, but their resources were limited: at the beginning of the twentieth century they could rotate with nitrogen-fixing crops such as legumes, or add naturally occurring fertilizers such as manure, guano, and nitrate mineral deposits mined in Chile.
The historical report of saltpeter suggests that one or more nitrate minerals may be present (or may have been present), but no nitrates were seen during this study.
No nitrate minerals were found during this study; but disseminated material could easily escape notice, and substantial masses may have been mined out.