2.8" Black Tourmaline (Schorl) Crystals & Goethite - Namibia

This is an association of brown goethite after siderite and black tourmaline (schorl), collected from the Erongo Mountains in Namibia.

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.


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DETAILS
SPECIES
Tourmaline var. Schorl & Goethite
LOCATION
Erongo Mountains, Namibia
SIZE
2.8" wide
CATEGORY
ITEM
#132221