This unusual semi precious gemstone cabochon material is Chinese Writing Rock, sometimes called Chinese Writing Stone.
Chinese Writing Rock is named for its interesting shapes of Feldspar crystals in a black Basalt.
This lapidary material is called a Porphyry, which is a term used for the textural consistency in igneous rock. This name is given to any igneous rocks with large grained crystals (such as feldspar or quartz) dispersed in a fine-grained silicate-rich matrix.
It comes from Auburn, California and was found while cutting a highway. Only so much was recovered before the highway was finished and unfortunately the area is now inaccessible.
Feldspar is the most common rock-forming mineral and makes up about 60% of the earth's crust. Feldspar occurs in igneous, metamorphic and sedimentary rocks. It is usually white or light colored and has a hardness of 6.
Metaphysical Properties of Chinese Writing Rock: Feldspar is said to assist one in detaching from the old, encouraging unconventional, exciting methods to attain ones goals. It can also assist in locating misplaced things.