* Pyroxene: The most abundant mineral in basalt, typically augite or pigeonite.
* Plagioclase feldspar: A white to gray feldspar mineral.
* Olivine: A green to olive-green mineral, often found in basalt.
* Magnetite: A black iron oxide mineral.
* Other minor minerals: These can include quartz, ilmenite, and apatite.
The specific composition of basalt can vary depending on the location where it formed, but the above minerals are generally present in significant amounts.
Here's a breakdown of the major components:
* Silica (SiO2): Basalt has a relatively low silica content, typically between 45% and 55%.
* Iron (Fe): Basalt is relatively rich in iron, which contributes to its dark color.
* Magnesium (Mg): Basalt is also high in magnesium, which is another reason for its dark color.
* Calcium (Ca): Basalt is also rich in calcium, which is a major component of plagioclase feldspar.
Basalt's composition, particularly its low silica content, makes it a very fluid lava that flows easily. This is why it forms extensive lava flows, often with a characteristic ropey or blocky surface texture.
