A beautiful jasper cabochon from the famous Morgan Hill, California loion. This stone weighs carats and measures about 43 x 25 mm with a very low dome height of about 4 mm. This stone has lots of red and white "pops" stered within a dark grayish green background.**. Shop.
Igneous Rock Bodies. Igneous rocks are common in the geologic record, but surprisingly, it is the intrusive rocks that are more common. Extrusive rocks, because of their small crystals and glass, are less durable. Plus, they are, by definition, exposed to the elements of erosion immediately. Intrusive rocks, forming underground with larger, stronger crystals, are more likely to last.