Schorl is the sodium iron (divalent) end member of the tourmaline group and the most common tourmaline species, which may account for 95 percent or more of all tourmaline in nature. The name was in use before 1400, because a village known today as Zschorlau in Saxony, Germany, was then named Schorl and black tourmaline was found at a nearby tin mine; the species forms brownish-black to black crystals. Opaque black schorl has a high magnetic susceptibility because of its high iron content, and schorl is usually found in granite and granite pegmatite. In this atlas it is the mineral species that black tourmaline records.
Facts
Hardness (Mohs)The Wikipedia article gives a range of 7.0 to 7.5 on the Mohs scale for tourmaline as a group; 7.25, the midpoint, is used here for schorl. Classification
Crystal SystemTrigonal (Rhombohedral) 1 Classification Connections
Classified As
Entity-backed identity for the material classification this material already carries as an enum fact, pointing at the class subcategory of the same name. The enum fact itself stays on the entity unchanged.
Crystallizes In System
Entity-backed identity for the crystal system this mineral already carries as an enum fact, phase 3 bucket conversion (docs\design_entity_backed_browse_buckets_20260928.md, w-bucketconv-divmore2-0929). The original fact stays on the entry unchanged.
In Discipline
In the Other Atlases
Sources
1. Tourmaline (Wikipedia)
Wikimedia FoundationSchorl, lead paragraph
The most common species of tourmaline is schorl, the sodium iron (divalent) endmember of the group.
Schorl, article text
It may account for 95% or more of all tourmaline in nature.
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