Rhyolite flow banded porphyritic igneous - authentic, uk seller
£ 12.60
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Authenticity Specimen: Rhyolite, Flow Banded Porphyritic Type: Igneous Rock Location Found: Scotland Scale cube=1cm: Full sizing please see photo Igneous Rocks are formed either deep underground within the earth, when magma becomes trapped in small pockets and slowly cools down to a solid form, Or above ground after volcano eruptions when lava cools down and becomes a solid form. Common types include Granite, Basalt, Gabbro, Pumice and Rhyolite. Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition. It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, sanidine and plagioclase. Biotite and hornblende are common accessory minerals. It is the extrusive equivalent to granite.
Authenticity Specimen: Rhyolite, Flow Banded Porphyritic Type: Igneous Rock Location Found: Scotland Scale cube=1cm: Full sizing please see photo Igneous Rocks are formed either deep underground within the earth, when magma becomes trapped in small pockets and slowly cools down to a solid form, Or above ground after volcano eruptions when lava cools down and becomes a solid form. Common types include Granite, Basalt, Gabbro, Pumice and Rhyolite. Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition. It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, sanidine and plagioclase. Biotite and hornblende are common accessory minerals. It is the extrusive equivalent to granite.
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