Silicates:
* Feldspar: A very common mineral group, often found in both plagioclase and orthoclase varieties.
* Quartz: A hard, glassy mineral, often found in rhyolitic and andesitic lava rocks.
* Pyroxene: A group of minerals with varying compositions, commonly found in basaltic and andesitic lava rocks.
* Amphibole: Another group of minerals with varying compositions, often found in andesitic and rhyolitic lava rocks.
* Olivine: A green, magnesium-rich mineral commonly found in basaltic lava rocks.
Other Minerals:
* Magnetite: A black, iron oxide mineral often found in basaltic lava rocks.
* Ilmenite: A black, titanium-iron oxide mineral also found in basaltic lava rocks.
* Apatite: A phosphate mineral, often found in small quantities in various lava rocks.
* Calcite: A carbonate mineral, often found in some lava rocks, particularly those formed from volcanic ash.
The specific minerals present in a lava rock will depend on the type of eruption and the source magma. For example, basaltic lava rocks, typically formed from eruptions with low viscosity, are often rich in olivine, pyroxene, and magnetite. Rhyolitic lava rocks, formed from eruptions with high viscosity, often contain quartz, feldspar, and amphibole.
It's important to note that lava rocks can also contain trace amounts of other minerals, and their specific composition can be analyzed in a laboratory.
