Origin: Antsirabe Region, Madagascar

Description: Black tourmaline from Madagascar, commonly referred to as schorl, is one of the most abundant and recognizable tourmaline varieties. It typically forms in elongated, columnar crystals with strong vertical striations running along the length. In rough form, these pieces often show natural terminations or broken ends, with a deep black color and a slightly matte to vitreous luster. Madagascan material is known for producing well-formed crystals, often with good size and structural integrity.

This tourmaline forms in pegmatites, which are extremely coarse-grained igneous rocks that crystallize from the final stages of magma cooling. These environments are rich in volatile elements like boron, which is essential for tourmaline formation. As the magma cools slowly, large crystals are able to develop, incorporating iron to produce the black coloration typical of schorl. Madagascar is a major global source of tourmaline, with deposits yielding a wide range of colors and crystal habits.

Black tourmaline is often associated with protection, grounding, and stability. Its dense, opaque appearance and strong crystal structure give it a solid, anchoring presence that many people are drawn to. It’s commonly chosen by those looking for a stone that feels steady and resilient, especially during periods of stress or change.

Chemical Composition: NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ (schorl variety of tourmaline)

Grade: Lapidary 
Appearance:  Opaque
Cracks: Medium/Many

Approximate Size of 1 pc: 60mm x 50mm x 40mm
Approximate Weight of 1 pc: 150g

Rough is rough. We do our best to grade and describe pieces in the lot, but ultimately, they all differ.