In addition to plagioclase feldspar and pyroxene, dolerite may contain a variety of accessory minerals. Some of the most common accessory minerals found in dolerite include:

Olivine: This is a green mineral that is common in many types of igneous rocks, including dolerite. It is often found as small, rounded crystals.

Magnetite: This is a black, metallic mineral that is commonly found in dolerite. It is often present in small, rounded grains.

Ilmenite: This is a dark, metallic mineral that is also commonly found in dolerite. It is often present as small, elongated crystals.

Apatite: This is a phosphate mineral that is commonly found in igneous rocks. It is often present as small, elongated crystals or as tiny, needle-like crystals.

Zircon: This is a common accessory mineral in many types of igneous rocks, including dolerite. It is often present as small, rounded crystals.

Biotite: This is a dark-colored mica mineral that is sometimes present in dolerite. It is often found as small flakes or grains.

Other possible accessory minerals in dolerite may include hornblende, orthoclase feldspar, quartz, and pyrite, among others. The specific mineral assemblage in a given dolerite sample may depend on factors such as the age of the rock, the location where it was formed, and the cooling history of the magma.

Dolerite is a dark, igneous rock with a medium-grained texture that is composed primarily of plagioclase feldspar, pyroxene, and sometimes olivine. Some of the key features of dolerite are:

Color: Dolerite is typically dark-colored, ranging from black to dark gray.

Texture: It has a medium-grained texture, which means that the individual mineral grains are visible to the naked eye.

Hardness: Dolerite is a hard rock, with a Mohs hardness of around 6-7.

Density: Dolerite has a relatively high density, typically ranging from 2.8 to 3.0 g/cm3.

Composition: Dolerite is primarily composed of plagioclase feldspar, pyroxene, and sometimes olivine. It may also contain other minerals such as quartz, biotite, or hornblende.

Occurrence: Dolerite is a common rock type found in many parts of the world, including parts of Africa, Australia, Europe, and North America. It is often found in dykes and sills, and may also form large intrusive bodies known as plutons.

Uses: Dolerite is a popular building stone and is often used as an aggregate in road construction. It is also used in the construction of monuments, as a decorative stone, and as a source of crushed rock for various industrial processes.