* Clastic sedimentary rocks are formed from fragments of other rocks (clasts) that have been weathered and eroded. Examples include sandstone, siltstone, and conglomerate.

* Non-clastic sedimentary rocks are formed from chemical precipitation or biological processes. Dolomite fits into this category.

How dolomite forms:

Dolomite forms through a process called dolomitization. This involves the replacement of calcium carbonate (CaCO3) in limestone by magnesium (Mg) ions. This process can happen in several ways:

* Direct precipitation from seawater or other magnesium-rich fluids.

* Replacement of limestone by magnesium-rich fluids circulating through the rock.

* Biogenic processes involving certain types of microbes that contribute to magnesium incorporation.

Therefore, dolomite is considered a non-clastic sedimentary rock due to its formation from chemical reactions and not from the accumulation of rock fragments.