WebHornfels is another non-foliated metamorphic rock that normally forms during contact metamorphism of fine-grained rocks like mudstone or volcanic rock (Figure 7.13). In some cases, hornfels has visible crystals of minerals like biotite or andalusite. If the hornfels formed in a situation without directed pressure, then these minerals would be ... WebThe protolith of hornfels can be even harder to distinguish, which can be anything from mudstone to basalt. Figure \(\PageIndex{12}\): (left) Macro view of quartzite. Note the interconnectedness of the grains. (right) Unmetamorphosed, unconsolidated sand grains have space between the grains.
Skarn - Wikipedia
WebFigure 10.21 Hornfels, a non-foliated metamorphic rock formed from a fine-grained protolith. Left- Hornfels from the Novosibirsk region of Russia from a sedimentary protolith. Dark and light bands preserve the bedding of the original sedimentary rock. The rock has been recrystallized during contact metamorphism and does not display foliation. WebLecture 2 Met Rocks Classification Eng.pptx - Metamorphic Petrology Lecture 2: Classification of Metamorphic Rocks METAMORPHIC PETROLOGY – pine city plumbing
Metamorphic Rock Types: Pictures and Descriptions
WebMetamorphic rocks can also be classified according to the chemical composition of the original source rock (protolith). Using this system, there are five main groupings: Pelitic: formed from aluminous sedimentary rocks, commonly shales and mudstones. These contain abundant micas. ... The inner or hornfels zone is composed of a hard, splintery ... WebNov 28, 2024 · Hornfels is a non-foliated and very fine-grained metamorphic rock with a variable composition. It is a very hard rock with a mottled brownish color. ... Common sedimentary protolith or parent rock for hornfels are shale, siltstone, limestone, sandstone, and dolomite. Granite, andesite, diabase, basalt, gabbro, and rhyolite are common igneous ... Web34 Metamorphic Classification • 2) Granular (non-foliated) rocks – hornfels, quartzite, marble Hornfels contact metamorphic rock of uniform grain size Quartzite very hard, non-foliated rock derived from quartz sandstone Marble mostly recrystallised calcite derived from limestone and dolomite pine city pennsylvania