Trachyte
Query URLs
https://term.museum-digital.de/md-de/tag/28424
- Note
- "Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF diagram). Biotite, clinopyroxene and olivine are common accessory minerals." - (en.wikipedia.org 04.10.2019)
References
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