Schorl AA Grade Tumblestone – Natural Black Tourmaline Crystal from Brazil

Description

Authentic Schorl (Black Tourmaline) Tumblestone from Brazil

This premium Schorl AA Grade Tumblestone is a natural, hand-polished crystal sourced from the renowned mineral-rich regions of Brazil. Each piece displays the deep, glossy black characteristic of high-quality Schorl, a member of the Tourmaline group prized for its protective and grounding energies. Every tumblestone has been carefully selected for its exceptional polish, texture, and mineral purity. The photos show the exact specimen you will receive, with a 1 cm scale cube included for accurate size reference. Each specimen comes complete with a Certificate of Authenticity, guaranteeing that it is a 100% genuine natural mineral.

Geological Background and Formation

Schorl, the black variety of Tourmaline, is a complex borosilicate mineral belonging to the Cyclosilicate Class and the Tourmaline Group. Its formation occurs through hydrothermal and pegmatitic processes, where mineral-rich fluids crystallise under high temperature and pressure within igneous rocks such as granite and pegmatite veins. Over millions of years, the slow cooling of these magmatic bodies allows the development of Tourmaline crystals, often alongside quartz, feldspar, and mica.

The Brazilian deposits where this specimen originates are renowned globally for producing gem-grade Tourmaline with rich luster and defined crystal structure. The black colouration of Schorl results from its high iron (Fe²⁺) content, which absorbs visible light, giving it a dense opaque appearance. The strong atomic bonding of aluminium, boron, silicon, and iron makes Tourmaline one of the most stable and durable silicate minerals found in nature.

Schorl-bearing pegmatites from Brazil often occur within ancient metamorphic terrains and are associated with tectonic processes that remobilised mineral fluids through fractures and cavities, allowing Tourmaline to crystallise in striking prismatic forms later polished into smooth, tactile tumblestones.

Mineralogical and Physical Characteristics

• Chemical Formula: NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
• Crystal System: Trigonal (Hexagonal symmetry)
• Hardness: 7–7.5 on the Mohs scale
• Lustre: Vitreous to submetallic
• Transparency: Opaque
• Streak: Grey to brownish-black
• Fracture: Uneven to subconchoidal

The AA grade polish of this tumblestone reveals a mirror-like shine, enhancing its natural aesthetic appeal. When viewed under bright light, subtle striations along the surface—relics of its original crystal form—can often be observed, demonstrating its authentic mineral origin. Its dense structure, durability, and smooth finish make it ideal for both collection display and metaphysical use.

Metaphysical and spiritual Associations

Schorl, or Black Tourmaline, is one of the most respected stones in metaphysical traditions for its reputed protective and grounding properties. It is believed to act as a spiritual shield, absorbing and transmuting negative energies into positive vibrations. Its smooth, tactile form captures the essence of geological beauty while symbolising protection and balance. Whether appreciated for its mineralogical value, spiritual symbolism, or decorative elegance, this specimen stands out as a timeless piece of Earth’s crystalline heritage.

Each stone is unique, reflecting millions of years of geological transformation and the artistry of natural mineral formation.

All of our Fossils and Minerals are 100% Genuine Specimens and come with a Certificate of Authenticity.

Scale cube = 1 cm – for full sizing, please refer to the photos.