Minerals are typically formed when molten rock, or magma, cools, or by separating ... quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement ...

About 400 kilometers northwest of Sydney, just south of Dubbo, lies a large and interesting body of rock formed around 215 ...

These rocks are formed when magma solidifies. As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard crystalline rock. Basalt is usually ...

A mineral crystallizes at a different temperature when exposed to different elements. Minerals formed in high temperatures are the first to crystallize as a magma cools within the earth. A solid ...