Here's a breakdown of what that tells us about the rock:
* Pyroxene and Olivine: These are both mafic minerals, meaning they are rich in magnesium and iron. They are common in rocks that form from the cooling of magma or lava.
* Igneous Rock: This means the rock formed from the solidification of molten material.
* Likely Rock Type: A rock with mostly pyroxene and olivine is likely to be a peridotite or a gabbro.
Peridotite: A very dense, dark-colored igneous rock found deep within the Earth's mantle. It's almost entirely composed of pyroxene and olivine.
Gabbro: A darker, coarser-grained igneous rock that often contains pyroxene, olivine, and plagioclase feldspar. It's found in the Earth's crust, particularly in areas of volcanic activity.
Other possibilities: There are other igneous rocks that could contain pyroxene and olivine, but in smaller amounts. For example, basalt (a volcanic rock) often contains pyroxene and olivine.
To determine the specific type of rock: You would need to examine the rock's texture (grain size, shape, and arrangement) and its mineral composition in more detail.
