1.23" Black Tourmaline (Schorl) & Feldspar - Namibia

Here is a sharp group of schorl crystals sitting on some beautifully terminated feldspar crystals from the Erongo Mountains in Namibia. Although the crystals have broken away from the original host rock, the specimen displays nicely on a flat surface.

Schorl, also known as "black tourmaline" or "black schorl", is a black form of tourmaline that often occurs as lustrous prismatic crystals. The crystals can be stubby or elongated and typically feature striations that run along the length of the crystal. Many schorl crystals have flattened pyramidal terminations. They can also form in radiating, columnar and stalactitic aggregations, as well as small needle-like inclusions within quartz (tourmalinated quartz) and in massive form.

Schorl is a basic sodium iron aluminum boro-silicate and the generic chemical formula is NaFe2 + 3Al6(BO3)3Si6O18(OH)4 . It has been used for everything from jewelry to piezoelectric guitar pickups.
Feldspars are a group of rock-forming tectosilicate minerals. It is also one of the most common minerals on earth, making up nearly 60% of the crust.

Tourmaline var. Schorl, Feldspar
Erongo Mountains, Namibia
Largest Schorl crystal is 1.23" long on 2.08x1.48" matrix