Trachyte
Rock
About it
Pale volcanic rock of feldspar with little quartz, the fine-grained match of syenite; tiny feldspar laths lined up with the flow give it a rough feel. Its name is Greek for rough; the Puy de Dôme in France is trachyte.
- Type
- Rock (igneous)
- Group
- Igneous (volcanic)
- Specific gravity
- 2.4–2.8
- Lustre
- dull
- Colours
- light grey, pale green, cream, pinkish, tan
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.