The problem is that iron, aluminum and sodium aren't normally found in crystalline igneous zircon—so how did these elements end up in the Martian zircon? The answer is hot water. In Earth rocks ...

Igneous rocks close igneous rockIgneous rocks ... These crystals will grow and interlock to form a hard crystalline rock. Basalt is usually formed when lava solidifies on the earth’s surface ...

Like other igneous rocks, the glossy glass originates from ... quickly cools into a solid material without the time for a crystalline phase. It’s typically composed of around 70 percent or ...