Siderogel
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Siderogel is an amorphous mineral (a mineraloid) consisting of iron(III) oxide-hydroxide FeO(OH), the same chemical compound as limonite and goethite;[1] or possibly an hydrate of the same FeO(OH)•nH
2O.[2]
Siderogel is described as blackish, brownish, or reddish-brown, often glassy and translucent.[3] It may be a gossan, the result of weathering and oxidation of sulfide ores.[4]
The International Mineralogical Association does not officially recognize siderogel as a mineral species.[5]