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Which mineral is abundant in Precambrian iron-formations and may be either digenetic or metamorphic in origin?
What is the dominant mineral in many Early Paleozoic ironstones, especially those of the Clinton Group (Silurian) of New York State?
Which mineral is the principal constituent of many post-Precambrian deposits, especially the Jurassic deposits of Europe?
What is the term best restricted to the yellow-brown amorphous product of subaerial weathering of iron oxide and other minerals?
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What mineral often occurs as oolites consisting of successive shells of oxide or alternating with chamosite?
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