Goethite Small 204×320 Medium 409×640 Large 654×1024 Download TIFF Original 1532×2400 | (493.7 KB) Description Goethite is a mineral composed of an iron hydrate crystallizing in soil and other low temperature environments. Keywords geology, goethite, mineral, soil Galleries Crystals Source: Encyclopaedia Britannica (11th ed., vol. 12) (New York, NY: The Encyclopaedia Britannica Company, 1910)