Definition: Actinolitic rocks are characterized by their absence of organic matter (such as silica, calcium carbonate) that forms minerals such as calcite in the mineralization process. Actinolitism refers to the absence or lack of organic matter, which is crucial for the mineralization of rock. The word 'actinolitic' comes from Latin and means "material with a crystalline structure." In this context, it describes rocks that have a crystalline texture without any significant amount of organic matter in them. The term can also be used to describe minerals or rocks that do not contain calcium carbonate (calcite), which is commonly associated with actinolitic rocks. The detailed definition of 'actinolitic' would depend on the context and type of rock being described. For example, a rock with crystalline texture without any significant amount of organic matter may be considered an 'actinolitic', while a rock that contains large amounts of organic matter (such as silicified marls) may be described as having a more diverse composition and therefore not necessarily fit the description of actinolitic rocks.

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