Basalt is an igneous rock, meaning it forms from the cooling and solidification of molten rock (magma or lava). While some basalt can contain crystals, they are typically very small, often microscopic. This is because basalt cools relatively quickly, which doesn't give the minerals enough time to form large crystals.

Here's why:

* Cooling Rate: Basalt cools rapidly, either on the surface as lava flows or within shallow intrusions. This rapid cooling prevents the atoms from arranging themselves into large, well-defined crystal structures.

* Composition: Basalt is primarily composed of plagioclase feldspar and pyroxene, which are minerals that tend to form smaller crystals.

* Crystalline Texture: Basalt often exhibits a phaneritic texture, meaning the crystals are too small to be seen without a magnifying glass or microscope.

However, there are exceptions:

* Slow Cooling: In some cases, basalt can cool very slowly, such as deep within the Earth's crust. This can lead to the formation of larger crystals, although still relatively small compared to other igneous rocks.

* Special Circumstances: Certain geological processes, like hydrothermal alteration or the presence of specific minerals, can sometimes lead to the formation of larger crystals within basalt.

In summary: While basalt can contain crystals, they are generally quite small. Only in very specific circumstances can you find larger crystals within basalt.