From crumbly coal to gleaming gems, unearth the wonders beneath your feet with these fascinating cards!  Learn how to identify rocks and minerals with photographs and clear descriptions.  For example, did you know that the diamond is actually the hardest mineral on earth? Diamonds formed millions of  years ago, under huge pressure, far beneath the earth's crust.  They only came close enough to the surface to be mined when unusually deep volcanoes erupted, forcing them up.  Discover more about how they form, where they are found and how they're used.  Important information about the mineral, such as the mineral class it belongs to, the chemical name, colors, streak, luster, hardness, and how it's formed are featured on each card. This is a wonderful set of cards to use for science fair projects on minerals, to teach geology lessons in the classroom, or to give to your favorite geology fanatic who needs an easy go-to system for classifying their collection!

Box Size: 6.25in (15.88cm) x 4.00in (10.16cm) x 1.00in (2.54cm)

Recommended for ages 7 and older.

Weight: 0 lb 12 oz ( 0.34 kg )