Black Tourmaline Rough Crystal Brazil Natural Schorl Tourmaline Mineral Specimen

Natural Rough Black Tourmaline Crystal – Brazilian Schorl Mineral Specimen

This rough Black Tourmaline crystal from Brazil is a genuine natural mineral specimen displaying the distinctive dark colour and striated crystal structure typical of the tourmaline mineral group. Left in its natural rough form, the specimen showcases the raw geological features created during crystal growth deep within the Earth.

Black Tourmaline is one of the most recognisable members of the tourmaline family and is commonly found in elongated prismatic crystal formations with vertical striations running along the length of the crystal faces. The photographs in this listing show the exact specimen you will receive, allowing collectors to examine the crystal structure, natural texture, and mineral formation before purchase.

This crystal is a genuine natural specimen and includes a Certificate of Authenticity lifetime guarantee generic card, confirming the authenticity of the mineral. Rough Black Tourmaline specimens are popular with mineral collectors, geology enthusiasts, and those interested in natural crystal formations.

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Mineralogy and Crystal Classification of Black Tourmaline

Black Tourmaline is the variety of tourmaline known scientifically as Schorl, a complex boron silicate mineral with the general chemical composition NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄. Schorl is the most common member of the tourmaline mineral group.

Tourmaline minerals crystallise in the trigonal crystal system and typically form long, vertically striated prismatic crystals. These crystals often display triangular cross-sections and can grow to significant sizes in suitable geological environments.

The black colour of Schorl results from high concentrations of iron within the mineral structure, which absorb light and produce the opaque black appearance characteristic of the mineral.

Tourmaline is known for its complex crystal chemistry and ability to incorporate a wide range of elements within its crystal lattice, resulting in many different colour varieties across the tourmaline group.

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Appearance and Natural Crystal Structure

Rough Black Tourmaline specimens commonly display several distinctive geological features, including:

• Deep black opaque colour

• Elongated prismatic crystal formations

• Strong vertical striations along crystal faces

• Rough natural terminations or broken growth surfaces

• Natural mineral inclusions or attached matrix

These characteristics formed naturally during crystal growth and are preserved in rough specimens, making them particularly appealing to collectors interested in natural mineral structures.

Because each crystal forms under unique geological conditions, no two specimens display identical crystal shapes or surface features.

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Geological Formation and Occurrence

Black Tourmaline most commonly forms within granitic pegmatites and hydrothermal veins, geological environments where mineral-rich fluids crystallise slowly under high temperatures and pressures. Pegmatites are known for producing large crystals due to the presence of water-rich magma that allows minerals to grow over extended periods.

Brazil is one of the world’s most important sources of tourmaline, including high-quality Black Tourmaline specimens. Brazilian pegmatite deposits have produced a wide range of tourmaline minerals, often associated with other minerals found in these geological environments.

Common associated minerals in tourmaline-bearing pegmatites include:

• Quartz

• Feldspar

• Mica

• Lepidolite

• Topaz

These mineral assemblages form when silica-rich magma cools slowly within fractures and cavities underground.

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Physical Properties of Tourmaline

Tourmaline minerals are known for several distinctive physical characteristics:

• Hardness of 7 to 7.5 on the Mohs scale

• Strong vertical crystal striations

• Trigonal crystal symmetry

• Complex borosilicate chemical structure

• Piezoelectric and pyroelectric properties under certain conditions

These features make tourmaline an important mineral for both geological study and mineral collecting.

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Traditional and Cultural Associations

In various cultural traditions and crystal practices, Black Tourmaline is sometimes traditionally associated with grounding symbolism and spiritual protection concepts. These interpretations are belief-based perspectives rather than scientifically established properties. Many collectors appreciate Black Tourmaline primarily for its striking crystal structure and geological formation.

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Authenticity and Display

• Mineral Type: Black Tourmaline (Schorl)

• Mineral Group: Tourmaline

• Chemical Composition: Sodium Iron Aluminium Borosilicate

• Crystal System: Trigonal

• Origin: Brazil

• Form: Natural rough crystal specimen

• Colour: Opaque black

• Authenticity: Genuine natural mineral specimen

• Includes: Certificate of Authenticity lifetime guarantee generic card

Full sizing can be seen clearly in the listing photographs. The images show the exact Black Tourmaline crystal you will receive, ensuring buyers receive the precise specimen displayed.

The combination of its distinctive prismatic crystal structure, deep black colour, and natural pegmatite origin makes rough Black Tourmaline a classic mineral specimen valued by collectors and enthusiasts of natural geological formations.