Rhyolite flow banded porphyritic igneous – authentic, uk seller

All of our Rocks are 100% Genuine Specimens & come with a Certificate of Authenticity

Specimen: Rhyolite, Flow Banded Porphyritic

Type: Igneous Rock

Location Found: Scotland

Size (picture scale cube=1cm): 46 x 34 x 46mm (1.81 x 1.34 x 1.81 inches)

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.