Roasting" is the process of removing excess components from these objects: for example roasting is done to galena to remove sulfur dioxide before smelting.
Various schemes for classifying the textures of these specimens label them as "colloform," "globular," or "fibrous," with cryptomelane being an example of "fibrous". The history of these objects is often studied using paragenesis, a technique which organizes the sequence of phases of the constituents that comprise these things. Meteoric water can create these specimens through an oxidative process called supergene enrichment. They are classified as syngenetic or epigenetic depending on the time of their formation. (*) SedEx regions produce these objects, which are often arranged into "banded formations" on the bottom of the ocean floor. "Roasting" is the process of removing excess components from these objects: for example roasting is done to galena to remove sulfur dioxide before smelting. For 10 points, name these rocks, such as cinnabar and bauxite, which contain minerals that are often extracted.
Various schemes for classifying the textures of these specimens label them as "colloform," "globular," or "fibrous," with cryptomelane being an example of "fibrous".
ores [accept mineral deposits before "minerals"] 