Rock Magnetism

[Anonymous]

Here is a really great explanation of rock magnetism. I thought it was good enough to warrant posting a link.

 

[Anonymous]

Hi Dave, Thanks very much for calling this to our attention. Now, I need to learn more how to recognize the different types of rocks.
Terry in Hawaii

 

[Anonymous]

thank you Dave, very interesting page , a must for PI people.

 

[Anonymous]

Thanks for the link, very interesting article.
I would like to add my grain of sand...
most clay that is used for making bricks contains some iron. When the brick is fired at high temperature the brick becomes slightly magnetic. These, bricks respond to the Pi detector. Now if we make a fire on the clay ground, the clay sommetimes gets "fired" and turns magnetic to the point that it makes a good size magnetic anomaly that can be located with a magnetometer. This way we can locate prehistoric dwellings. Such places also respond strongly to the Pi detector. The same happens if I burn a large pile of brush wood. Thinking of the frequent Australian brush fires, could this be one of the reasons for the "hot" ground?