Rock hound flashcard

Front

What is volcanic glass?

Back

Obsidian is called volcanic glass because it forms from the rapid cooling of lava.

Front

What is hematite?

Back

Hematite is a mineral form of iron oxide and is often used as a pigment.

Front

What is the hardest rock?

Back

Diamond is the hardest known natural material.

Front

What is the softest rock?

Back

Talc is the softest mineral on the Mohs hardness scale.

Front

What is galena?

Back

Galena is a mineral that is the primary ore of lead.

Front

What is quartz?

Back

Quartz is a common mineral made of silicon and oxygen, known for its hardness.

Front

What is the Mohs hardness scale?

Back

The Mohs hardness scale is a scale used to measure the hardness of minerals.

Front

What is the difference between igneous and sedimentary rocks?

Back

Igneous rocks form from cooled magma or lava, while sedimentary rocks form from the accumulation of sediment.

Front

What is the process of rock formation called?

Back

The process of rock formation is called the rock cycle.

Front

What is a mineral?

Back

A mineral is a naturally occurring inorganic solid with a definite chemical composition.