Phonolite – Madeira
£1.50 – £4.00
Phonite is an igneous rock with a coarse grain texture, these specimens are from Pico Ruivo, Madeira, Portugal and have a grey colour with fine crystalline form. An uncommon rock, samples are supplied in a white card tray and come with an information label.
Phonolite is an extrusive igneous rock with a texture which ranges from fine to coarse grained, it has a intermediate chemical composition between felsic and mafic and is a fairly uncommon rock. These particular specimens are found in Pico Ruivo, Madeira, Portugal and exhibit a charcoal grey colouration and fine grained texture.Hard and dense, these rock samples are available in various sizes and come supplied in a white card tray and come with an information label.