Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Intermediate Rocks

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1162

Intermediate rocks are another large group of igneous rocks. The rocks contain 53–66% SiO2. The main mineral is feldspar, often with a small amount of quartz. Intermediate rocks contain more dark minerals, such as hornblende and pyroxene (usually approximately 30%), than acidic rocks. Common intrusive intermediate rocks include diorite and quartz diorite, and common extrusive intermediate rocks include andesite and dacite.

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