Complete with photos and information about each rock’s distinguishing characteristics, this rock identification guide has been designed to assist you in identifying the rocks provided in the Deeper and Deeper and Mining Matters II kits
Basalt is an extrusive igneous rock that is very dark in color It is the most common type of rock in the Earth's crust and it makes up most of the ocean floor It is made of many dark colored minerals such as pyroxene and olivine Basalt also contains some light colored minerals such as feldspar .
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Basalt: Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in colour, and comparatively rich in iron and magnesium Some basalts are quite glassy (tachylytes), and many are very fine-grained and compact
Basalt is the most common volcanic rock, constituting nearly all of the oceanic crust and covering parts of the continents This gallery presents some of basalt's variety, on land and in the ocean Pictures 1, 2, 10 13 and 15 17 are flood basalt; pictures 5, 8 and 9 are ocean island basalt; 3, 6 .