Black Tourmaline (Schorl) | Wheal Cal, St Just, Cornwall | No. 3

A striking Black Tourmaline (Schorl) specimen from Wheal Cal, St Just, Cornwall, featuring a densely textured surface of dark, naturally formed crystals with subtle metallic-looking reflections and contrasting pale mineral inclusions.

This 55g Cornish mineral specimen has a distinctive angular shape, with a broad, uneven crystalline face and a narrower, wedge-like profile. Its predominantly charcoal-black colouring is interrupted by occasional rusty-brown mineral staining and small areas of pale grey-white mineral material.

Across the main surface, numerous Black Tourmaline crystals form a compact, interlocking arrangement. Their fine longitudinal striations and reflective crystal faces create an intricate texture, particularly where the light catches the exposed formations.

One of the most interesting features is the contrasting pale mineral material visible near the upper edge. Small dark crystal fragments appear within and around this lighter section, highlighting the relationship between the Tourmaline and its surrounding host material.

From the side, the specimen reveals an irregular, naturally fractured structure, with dark mineral-rich surfaces extending through the piece. Its reverse displays further densely packed crystalline textures, making this an interesting specimen to examine from multiple angles.

Weighing approximately 55g and measuring 33.9mm × 48.2mm, this compact mineral specimen is a lovely addition to a collection of Cornish minerals, British mining specimens or natural Tourmaline formations.

About the Mineral

Black Tourmaline, commonly known as Schorl, is an iron-rich member of the Tourmaline mineral group.

Schorl is a complex borosilicate mineral, typically black to very dark brown in colour, with a vitreous lustre and a Mohs hardness of approximately 7 to 7.5.

Tourmaline commonly develops elongated prismatic crystals, frequently displaying fine vertical striations along their surfaces. Crystal groups may occur as parallel aggregates, interlocking formations or radiating clusters.

Schorl is particularly associated with granite-related geological environments, including pegmatites and hydrothermal mineral veins, where boron-rich fluids contribute to its formation.

Cornwall is historically recognised for its diverse Tourmaline occurrences, with Schorl documented in several of the county's granite-associated mineral districts.

Wheal Cal (Wheal Call), St Just, Cornwall

Wheal Cal, also historically recorded as Wheal Call, Wheal Cole and Wheal Caul, is associated with the historic Boswedden mining complex in the Kenidjack Valley near St Just, Cornwall.

The mine forms part of the wider St Just mining district, one of Cornwall's most historically important areas for tin and copper extraction.

Mining activity around Wheal Call dates back to at least the eighteenth century, with the workings subsequently incorporated into the neighbouring Boswedden and Wheal Castle mining operations.

Historical records document the combined workings operating as Boswedden and Wheal Castle between 1836 and 1872, before becoming associated with Wheal Cunning United.

The mining complex extracted tin, copper and iron from mineralised veins running through the surrounding geological formations.

The Kenidjack Valley contains an extensive network of historic mine workings, where mineral-rich hydrothermal fluids circulated through fractured rocks and deposited metallic ores alongside a variety of associated minerals.

Black Tourmaline (Schorl) is a documented mineral occurrence within the wider St Just mining district. This iron-rich Tourmaline is associated with granite-related geological environments and boron-rich mineralising fluids.

This specimen is recorded as originating from Wheal Cal and offers a fascinating connection to Cornwall's historic mining heritage, combining naturally formed black crystals with the rugged, iron-stained character of the surrounding matrix.

Intention

Protection & Grounding
Within crystal traditions, Black Tourmaline is associated with protection, grounding, stability and emotional resilience.

It is traditionally regarded as a symbolic stone for establishing personal boundaries, maintaining focus and encouraging a sense of security during periods of uncertainty.

Its dark, earthy appearance also connects it symbolically with strength, steadiness and remaining grounded in everyday life.

Associated Chakras

Root Chakra
Black Tourmaline is most commonly associated with the Root Chakra, representing grounding, stability, security and connection to the physical world.

Its deep black colouring is traditionally linked with protective symbolism and establishing a strong personal foundation.

Shape Symbolism

Raw Mineral Specimen
Raw crystals are traditionally associated with authenticity, natural strength and connection to the Earth.

This specimen retains its original irregular form, exposed crystalline structures and natural mineral textures, preserving the individual character of the stone.

Within crystal traditions, unpolished mineral specimens symbolise resilience, individuality and the beauty of natural geological formation.

Specimen Details

• Mineral: Black Tourmaline (Schorl)
• Locality: Wheal Cal (Wheal Call), St Just, Cornwall, England
• Shape: Raw Mineral Specimen
• Finish: Natural / Unpolished
• Weight: Approx. 55g
• Dimensions: Approx. 33.9mm × 48.2mm
• Colours: Charcoal black, dark grey, rusty brown and pale grey-white
• Intention: Protection & Grounding
• Associated Chakra: Root Chakra
• Collection: Cornish Minerals

You will receive the exact Black Tourmaline specimen photographed. Natural variations in crystal formations, mineral staining, matrix, surface texture and irregular edges are part of the individual character of this Cornish mineral specimen.

Mineral identification and mine attribution follow the supplied specimen information.

Handle carefully around exposed crystals and avoid abrasive cleaning. Keep dry and gently remove dust using a soft brush.