Mount Tambora is a stratovolcano, which means it is composed of layers of andesite and dacite. These are intermediate igneous rocks, meaning they fall between mafic (like basalt) and felsic (like granite) in their mineral composition.

Here's a breakdown of the rocks found in Mount Tambora:

* Andesite: This rock is typically gray to dark gray in color and has a fine-grained texture. It is rich in plagioclase feldspar and pyroxene, with lesser amounts of amphibole and biotite.

* Dacite: This rock is similar to andesite, but it has a higher silica content and may contain quartz. It is often lighter in color than andesite and can have a porphyritic texture, meaning it contains larger crystals embedded in a finer-grained matrix.

The specific composition of the igneous rocks found in Mount Tambora can vary slightly depending on the location and age of the rock. However, andesite and dacite are the dominant types of igneous rocks that make up this volcano.