Basalt Dark Blue/Grey – Tertiary Basalt, Skye (rock sample)
$12.52
$17.9
Description All our rocks are carefully selected for educational study. Average specimen size is shown below. These are ideal for classroom teaching and are a size that can be easily passed round the classroom for students to get a feel for each type. Basalt is a mafic extrusive igneous rock formed from the rapid cooling of lava rich in magnesium and iron exposed at or very near the surface of a terrestrial planet or a moon. Approx: 30-50mm
