Anorthite is one of the plagioclase feldspars, an important group of minerals abundant in the Earth's crust. Anorthite's chemical formula is CaAl2Si2O8.
Anorthite is the calcium-rich endmember of the plagioclase system, the other endmember being albite (sodium-rich). The range of intermediate compositions have varying ratios of calcium and sodium ions.
Calcium has the ability to make the soil act like a sponge to absorb water and oxygen.
It is a central component of all aluminosilicate minerals such as clays, hence the name.
This material is igneous in origin and the dark (blue hue) indicates that the material is mafic ie comparatively higher proportion of iron, magnesium and calcium with lower levels of Si compared to granite.
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