Gruesome California Crime Stories That May Play A Part In âTrue Detectiveâ Season 2. Nic Pizzolatto isnât letting us into his warped, deviant mind when it comes to salient plot points surrounding the second season of the highly-acclaimed HBO anthology series, True Detective, but he has dropped a few hints.
Rhyolite: Fine-Grained Felsic Rock Most rhyolites are light gray to pinkish in color, but red or even black rhyolites are not rare. Most rhyolites are porphyritic and are identified by the quartz phenocrysts and white to salmon K-feldspar phenocrysts. The groundmass is aphanitic or even glassy.
Felsic rocks are dominated by minerals that are light in color, such as quartz, feldspar, and mica. The extrusive rock rhyolite and its intrusive counterpart gran-ite are examples of felsic rocks. Mafic rocks are dominated by minerals that are dark in color, such as amphibole, pyroxene, and olivine. Exam-ples include the extrusive rock basalt and the intrusive rocks gabbro and diabase. Many felsic rocks form from magma that originated in continental crust.