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Among the important seabed critical minerals thought to be with U.S. waters are cobalt-rich ferromanganese crust, phosphorite and polymetallic sulfide.—Noël Fletcher, Forbes.com, 25 Apr. 2025 The other important minerals available in significant quantities are limestone, dolomite, manganese, mica, china clay, graphite, fire clay, coal bed methane, uranium, phosphorite, apatite, quartz, gold, feldspar and pyroxenite.—Gurvinder Singh, Quartz India, 4 Oct. 2019
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