Collection of 15 magmatic rocks
Collection of 15 plutonic and volcanic magmatic rocks.
- Pegmatite: is a granulated plutonic rock with a composition similar to that of granite.
- Granite: it is a crystalline rock that consists of potassium feldspar and quartz and that also generally presents hornbend and mica as accessory minerals.
- Syenite: is a plutonic magmatic rock composed of alkaline feldspa and accessory minerals such as hornbend and biotite.
- Anortosite: is a magmatic rock composed almost entirely of feldspar (90-100%) and small amounts of quartz.
- Gabro: is a crystalline plutonic rock composed of plagioclase and small amounts of Augite.
- Porphyritic rhyolite: contains large feldspar crystals in an apical mass of alkaline and quartrz feldspars.
- Porphyritic trachyte: it is composed of potassium feldspar, plagioclase feldpat and accessory minerals such as horneblend.
- Basalt: is an extrusive magmatic rock composed of plafioclase and pyroxene.
- Riolite: is a colored rock composed of crystalline potassium micro feldspar, quartz and other accessory minerals.
- Andesite: is a colored rock composed of plagioclase feldspar, horneblend, biotite and augite.
- Tuff: is formed by compacted volcanic fragments.
- Obsidian: it is a glazed volcanic rock formed from the rapid cooling of rhyolitic lava.
- Pitchstone: it is formed from the rapid cooling of rhyolitic lava and has a resinous appearance.
- Pumice stone: it is a volcanic rock of rhyolitic composition, whose texture results from bubbles formed by released gases.
- Scoria: it is a dark rock of basaltic composition with a porous texture caused by released gases.