👉 A phosphoritic rock is a type of igneous rock that contains high levels of silicon dioxide, which gives it its distinctive white color. These rocks are commonly found in the Earth's crust and can be produced by volcanic activity or through metamorphism processes. The presence of this material in igneous rocks suggests that they have been subjected to high pressure,高温,或高压，高温或高压的地质作用，从而形成了独特的颜色和结构。
