Schorl is the most common species of tourmaline, however, it is not as commonly faceted as its brightly colored brothers and sisters because of its black color. Well-formed schorl crystals make striking mineral specimens and long, thin schorl crystals are frequently found in quartz, called "tourmalinated quartz."
- Optical Properties
- Characteristic Physical Properties
- Chemistry & Crystallography
Doubly Refractive (DR)
3.000-3.260 Range:0.2/-0.06 Typical:3.060
Schorl often has tube-like 2-phase inclusions running parallel to crystal's principle axis, film-like, irregular or thread-like liquid inclusions, angular thin film mirror-like inclusions, gas inclusions in mesh-like pattern, parallel oriented hollow tubes or needles.
Poor, in two directions
Sodium Iron Aluminum Boro-Silicate Hydroxide
Countries of Origin
Pakistan; Unknown; Namibia; Madagascar