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|composition_secondary=[[biotite]], [[chlorite]], [[hematite]], [[pyrite]] ...r [[illite]], often along with [[biotite]], [[chlorite group|chlorite]], [[hematite]], and [[pyrite]] and, less frequently, [[apatite]], [[graphite]], [[kaolin

...Sand Dunes State Park]], [[Utah]]. These are grains of [[quartz]] with a [[hematite]] coating providing the orange color. Scale bar is 1.0 mm.]]

.../sub>O₃—the form of [[iron oxide]] found as the [[mineral]] [[hematite]], and FeS₂—[[pyrite]] (fool's gold).<ref>{{cite journal|last=

*Forest iron — iron from the [[Forest of Dean]], where [[hematite|haematite]] ore enabled tough iron to be produced.

...f [[iron oxide]]s, either [[magnetite]] (Fe₃O₄) or [[hematite]] (Fe₂O₃), alternating with bands of iron-poor [[sha ...ay 2010}}. Industrially, iron production involves iron ores, principally [[hematite]] (nominally Fe₂O₃) and [[magnetite]] (Fe₃

...mine to be about 43,000 years old, [[paleolithic]] humans mined mineral [[hematite]], which contained [[iron]] and was ground to produce the red [[pigment]] [