Ask-A-Geologist Question: How to determine mineral hardness with the Mohs scale

Question: Based on Mohs hardness scale an unknown mineral scratched Apatite. It also scratches a steel knife blade but it cannot scratch quartz. What is the mineral’s hardness?

New User Licenses Available for Mini Me Geology eBooks

We are really excited to announce that all of our eBooks are available with licenses for home school groups, individual classrooms and schools. Each license is good for the life of the eBook.

Ask-A-Geologist Question: What is syenite used for?

We received a great question about syenite at our Ask-A-Geologist section. If you want to submit your own question, we would love to hear from you. Here is today’s question: Question:   What is syenite used for? Answer:   Syenite is an igneous rock that is usually gray, pink or violet in color. Because it is an […]