Green lines in dolerite or diabase (black granite)
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Diabase is a type of igneous rock that is composed mainly of plagioclase feldspar and pyroxene minerals, and sometimes olivine as well. Olivine is a green mineral that is typically found in mafic igneous rocks such as basalt and gabbro, but it can also occur in diabase. If olivine is present in diabRead more
Diabase is a type of igneous rock that is composed mainly of plagioclase feldspar and pyroxene minerals, and sometimes olivine as well. Olivine is a green mineral that is typically found in mafic igneous rocks such as basalt and gabbro, but it can also occur in diabase.
If olivine is present in diabase, it may appear as green lines within the rock. These green lines are typically the result of olivine crystals that grew along fractures or fissures in the rock, creating a vein-like pattern of green mineral throughout the diabase.
The formation of these green lines is typically the result of a process known as hydrothermal alteration, where hot fluids or gases move through the rock and alter the minerals within it. In the case of diabase, olivine can be altered by these fluids to form a variety of different minerals, including serpentine and talc, which can appear as green-colored minerals within the rock.
The presence of olivine green lines in diabase can provide useful information about the conditions under which the rock formed and the processes that have affected it since its formation. Geologists may use this information to understand the geological history of an area or to identify mineral resources that may be present within the rock
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