Both sedimentary rocks and igneous rocks are rocks, meaning they are naturally occurring solid materials made up of one or more minerals. Beyond that, they have some important differences:

How they form:

* Igneous rocks form from the cooling and solidification of molten rock (magma or lava).

* Sedimentary rocks form from the accumulation and cementation of sediments (fragments of other rocks, minerals, or organic matter).

Texture:

* Igneous rocks often have a crystalline texture, where individual mineral grains are visible.

* Sedimentary rocks typically have a clastic texture, meaning they are made up of fragments cemented together. They can also have other textures, like organic, chemical, or biochemical.

Composition:

* Igneous rocks have a wide range of compositions, depending on the source of the magma and the cooling process.

* Sedimentary rocks are typically composed of minerals that are stable at the Earth's surface, like quartz, feldspar, and clay minerals.

Here's a table summarizing their key differences:

| Feature | Igneous Rocks | Sedimentary Rocks |

|---|---|---|

| Formation | Cooling and solidification of molten rock | Accumulation and cementation of sediments |

| Texture | Crystalline | Clastic, organic, chemical, biochemical |

| Composition | Wide range of minerals | Stable surface minerals like quartz, feldspar, clay |

Despite these differences, they both play an important role in the rock cycle. Igneous rocks can be weathered and eroded to form sediments, which then become sedimentary rocks. Both types of rocks can be subjected to heat and pressure, which can transform them into metamorphic rocks.