, potassium feldspars have a pinky or reddish or white, hard blocky crystal masses that exhibit cleavage in two directions. The resulting cleavage faces meet nearly at right angles. Potassium feldspars are particularly common in felsic igneous rocks, metamorphic rocks, or the sandstone that formed during erosion of felic igneous or metamorphic rocks.
If you are looking for potassium you would rather mine potash to turn into the fertilizer, its most common usage. K feldspar itself has some uses too, in making porcelain, for example.
K feldspar formed from magma (molten rock) which erodes and its potassium enters the ocean from where it can precipitate when seawater evaporates. We got this important element in our bodies (blood, basically seawater) because all life on Earth was created in the sea.
K-feldspar is commonly found in igneous rocks, particularly intrusive rocks like granite and syenite. In addition mineral-rich fluids can alter pre-existing rocks and deposit minerals like K-feldspar. Besides that, the weathering and erosion of pre-existing rocks can expose K-feldspar-rich minerals.
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