Black Tourmaline

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Black Tourmaline Crystals Black tourmaline, known to mineralogists as schorl, is the most common member of the tourmaline family and one of the most popular collecting minerals. Its deep black color comes from iron within its complex boron silicate structure, and it typically forms glossy, striated prismatic crystals in granite pegmatites. Black tourmaline rates 7–7.5 on the Mohs hardness scale, making it exceptionally durable. Major sources include Brazil, Pakistan, Afghanistan, Madagascar, and Namibia. One of black tourmaline's most interesting properties is piezoelectricity — it generates a small electrical charge when subjected to mechanical pressure. This makes it scientifically notable beyond its visual appeal. The elongated, columnar crystal habit with parallel striations along the c-axis is characteristic and makes even rough specimens immediately recognizable. Available forms include raw specimens, polished palm stones, towers , tumbled pieces, and bracelets . For other dark minerals, see our obsidian and smoky quartz collections. Compare with other tourmaline varieties including pink, green, and watermelon. Browse our protection crystals collection for curated sets. Free shipping on orders $150+. Frequently Asked Questions What is black tourmaline? Black tourmaline (schorl) is an iron-rich boron silicate mineral and the most abundant member of the tourmaline group. It crystallizes in the trigonal system, forming elongated prismatic crystals with characteristic vertical striations. It rates 7–7.5 on the Mohs hardness scale. What is the difference between black tourmaline and obsidian? Black tourmaline is a crystalline mineral (boron silicate, Mohs 7–7.5) with visible striations and prismatic crystal habit. Obsidian is volcanic glass — an amorphous solid (Mohs 5–5.5) with conchoidal fracture and no crystal structure. Tourmaline is harder, has piezoelectric properties, and forms defined crystal shapes. Where does black tourmaline come from? Major sources incl