Phosphorous

In nature, phosphorous is found in the Earth's crust, ~0.12 % (w/w), in minerals such as chlorapatite, fluorapatite, vivianite, wavelite and phosphite [6]. The isotope found in nature is ³¹P (100 %, stable) [6].

In pure solid form, phosphorous as P₄ exist as:
α-form: cubic crystal at > -79.6 °C [6].
β-form: hexagonal crystal at < -79.6 °C [6].