Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The mineral compositions (in %) of quartz diorite and rhomb porphyry.
| Material | Quartz | K-feldspar | Plagioclase | Amphibole | Calcium | Epidote | Chlorite | Muscovite |
|---|---|---|---|---|---|---|---|---|
| Quartz diorite | 27.5 | 12.0 | 32.0 | – | – | 15.0 | 10.5 | 3.0 |
| Rhomb porphyry | 4.5 | 31.0 | 47.0 | 3.0 | 2.0 | – | 5.5 | 7.0 |
