Wikipedia contributors. Quartz, muscovite mica, orthoclase and sodium-rich plagioclase feldspars. Pumice Reticulite: Reticulite is a basaltic pumice in which all of the bubbles have burst, leaving a honeycomb structure. Photograph by J.D. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. 2. Granite, basalt, obsidian, rhyolite, pumice, scoria, andesite, diorite, gabbro The object is to see the relationships between the terms and the rocks. Hence, there are much more pores in pumice than in scoria and they are smaller. Close examination of fresh pumice … Pumice is usually felsic, but no strict chemical definition exists. Rock & Mineral Kits: Get a rock, mineral, or fossil kit to learn more about Earth materials. The mafic lava usually has a low viscosity and is running. It is rock foam with so much air in its structure that it often floats on water. 1. 1. Close examination of fresh pumice shows its glassy nature. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid. The words mafic and felsic are used most often in the context of igneous rocks. That’s why gas bubbles can move more freely and join each other and form larger vesicules. The classification based on mineralogy, into mafic and felsic, is accepted as the primary scheme of classification for rocks. 3. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron.Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Monogenetic volcanism produces small eruptive volumes with short eruption history, different chemical compositions, and relatively simple conduit. Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. Scoria is a mafic volcanic glass. The best way to learn about rocks is to have specimens available for testing and examination. There will definitely be more than one rock listed for each. It is usually dark-colored and has a mafic composition. mafic: Ca-plagioclase, pyroxene, olivine, amphibole: basalt: FROTHY TEXTURE (POROUS, PUMICEOUS) Originates in gas-charged volcanic eruptions, commonly pyroclastic. Griggs, USGS image. It is an extremely vesicular basaltic lava with very small (< 1mm) vesicles. List all of the rocks that are mafic. The silicic and felsic matter may include rhyolite, dactite, andesite, phonolite, pantellerite, trachyte, and (less commonly) basalt. Mafic, infact it is often refered to as: "the mafic version of pumice" 0 0 1 ... Volcanic ash can be mafic, felsic, or intermediate. However, it is more often felsic than mafic. Bubbles that form in felsic magma can not move as well. These rocks have several similarities. 4. Is pumice felsic or mafic? Mafic magma is less viscous than felsic magma. Scoria and Pumice. It is rock foam with so much air in its structure that it often floats on water. Pumice is a felsic volcanic glass. List all of the rocks that are felsic. The bubbles frozen in the rocks are called vesicles. List all of the rocks that are intermediate. Gabbro is the name given to intrusive mafic rocks, whereas basalt is the name given to extrusive mafic rocks. Composition Most Common Minerals Rock Name; felsic: glass (may contain a few minerals typical of felsic rocks) pumice: mafic: glass (may contain a few mineral typical of mafic rocks) They inform about the chemical composition of the various types of rocks. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Intrusive Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded … Properties While pumice occurs in a variety of colors, it is almost always pale. Pumice is a froth of felsic volcanic glass. 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