Polarized Light Microscopy Digital Image Gallery

Green Slate

The mineral composition of slates is quite various, which results in a wide range of colors that may occur in the rock. Green slates are usually formed when there is significant quantity of chlorite, a dark green clay mineral, present. Red and purple varieties, however, typically owe their hues to the presence of hematite, and carbonaceous material is often the source of the color in dark gray or black slates.


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