Conchoidal is an adjective mostly used in mineralogy to refer to a particular type of fracture which follows an unnatural plane of separation, as occurs with some type of minerals such as obsidian. It is especially common in rocks or minerals which are amorphous or have fine grained crystals.
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Advice (also called exhortation) is a form of relating personal or institutional opinions, belief systems, values, recommendations or guidance about certain situations relayed in some context to another...