Black Tourmaline B Dragon Egg Stone both species look alike so

both species look alike so the generic name  "Apophyllite" is used

These pieces only have one-side polished

Mahogany Obsidian is characterized by its reddish-brown hues attributed to iron and hematite inclusions during its formation

unlike any other stone

5 million tons of Pinolite were extracted from the Lower Tauern Mountain range

Black Tourmaline B Dragon Egg Stone both species look alike soBlack Tourmaline, scientifically known as Schorl, can originate from the crystallization of molten rock deep within Earth's crust. It has a hardness of 7 7. 5 on Mohs scale with a trigonal crystal structure. The black color is often due to the presence of iron impurities within the crystal structure. This particular specimen is from Namibia, South Africa. Measuring 1 inch in height, 1. 4 inches in length, and 1 inch in width. Weighing 1. 8 ounces.