Green Tourmaline in Feldspar Quartz Matrix Natural Crystal Specimen

Green Tourmaline in Feldspar and Quartz Matrix – Natural Pegmatite Mineral Display Piece

This Green Tourmaline in Feldspar and Quartz Matrix is a genuine natural crystal specimen, carefully selected for its attractive colour contrast, well-defined crystal structure, and strong display appeal. The photographs in this listing show the exact specimen you will receive. Please refer to the images for full sizing and scale details.

Each crystal includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine, naturally formed mineral specimen.

Mineral Species & Crystal Classification

Green Tourmaline belongs to the tourmaline supergroup, a complex borosilicate mineral group with a general formula of XY₃Z₆(T₆O₁₈)(BO₃)₃V₃W. Most green tourmaline specimens are classified within the species Elbaite (a lithium aluminium borosilicate), though colour can vary depending on trace element chemistry.

Tourmaline crystallises in the trigonal crystal system and commonly forms elongated, prismatic crystals with vertically striated faces and a triangular cross-section. Terminations may be flat, stepped, or slightly pyramidal depending on growth conditions.

The surrounding matrix typically consists of feldspar (commonly microcline or albite) and quartz (SiO₂), both standard components of granitic pegmatites.

Colour, Clarity & Crystal Features

The green colour in tourmaline is generally caused by trace elements such as iron, chromium, or vanadium incorporated during crystal growth. Shades can range from soft olive green to deeper forest tones depending on chemical composition and light exposure.

Tourmaline crystals may be translucent to transparent in thinner sections, while appearing more opaque in thicker areas. Natural vertical striations along the prism faces are characteristic growth features.

The feldspar matrix often appears white, cream, or pale pink, while quartz may present as clear, milky, or slightly translucent. The combination of dark green prismatic crystals embedded in lighter matrix rock creates strong visual contrast.

No artificial dyes or treatments have been applied; the specimen is entirely natural.

Geological Formation & Pegmatite Environment

Green tourmaline in feldspar and quartz matrix forms in granitic pegmatite environments. Pegmatites are coarse-grained igneous rocks that crystallise from the final stages of magma cooling, where mineral-rich fluids concentrate rare elements such as lithium, boron, and fluorine.

As these fluids cool slowly in open pockets or fractures, large, well-formed crystals develop. Tourmaline forms as boron-rich fluids interact with aluminium- and silica-bearing material in the pegmatite system.

The association of tourmaline with feldspar and quartz is typical of complex lithium-bearing pegmatites, which are known for producing large and well-formed crystal specimens.

Collecting & Display Appeal

Green tourmaline in matrix is highly valued by mineral collectors due to the strong aesthetic contrast between prismatic crystals and pale host rock. Matrix specimens are particularly desirable because they preserve the natural geological setting of crystal formation.

From a mineralogical perspective, this specimen demonstrates classic pegmatitic crystallisation processes and trigonal crystal symmetry. It also provides an excellent educational example of borosilicate mineral formation.

In some traditions, green tourmaline is traditionally associated with balance and growth; however, it is primarily appreciated as a naturally occurring borosilicate mineral formed in granitic pegmatite systems.

Authenticity & Presentation

• Genuine Green Tourmaline in Feldspar and Quartz Matrix
• Tourmaline Supergroup – likely Elbaite species
• Borosilicate mineral composition
• Trigonal crystal system with prismatic habit
• Natural pegmatite matrix specimen
• Untreated and unenhanced
• Exact specimen shown in listing photographs
• Includes Certificate of Authenticity lifetime guarantee generic card
• Full measurements available in listing images

A carefully chosen natural mineral display piece showcasing green tourmaline crystal growth within its original pegmatite matrix.