Black Tourmaline (Schorl) | Wheal Cal, St Just, Cornwall | No. 1

A fascinating Black Tourmaline (Schorl) mineral specimen from Wheal Cal, St Just, Cornwall, displaying dark crystalline formations within a rugged, naturally iron-stained matrix.

This 95g specimen features a dramatic combination of charcoal-black mineralisation, rusty-orange staining and small areas of pale mineral material. The contrasting colours highlight the natural geological textures and give the piece a wonderfully earthy, unpolished appearance.

One of its most interesting features is the concentration of Black Tourmaline crystals visible across the darker surfaces. Several exposed formations display elongated, blade-like appearances with fine parallel striations and reflective crystal faces.

Small groups of crystals occur in tightly packed arrangements, with some forming radiating, fan-like patterns. As the specimen is moved beneath the light, these glossy black crystalline areas stand out against the surrounding darker, more granular matrix.

Along one side, a substantial area of rusty-orange and ochre-coloured iron staining creates a striking contrast with the black mineral formations. Small pale mineral patches and irregular natural cavities add further detail.

The reverse displays a more compact, weathered appearance, with uneven mineral surfaces and subtle variations between charcoal grey, dark brown and earthy greenish-grey tones.

Measuring approximately 62.5mm × 38.1mm and weighing 95g, this is a characterful natural specimen with plenty of visual interest, particularly suited to collectors of British minerals, Tourmaline and historic Cornish mining specimens.

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, St Just, Cornwall, England
• Shape: Raw Mineral Specimen
• Finish: Natural / Unpolished
• Weight: Approx. 95g
• Dimensions: Approx. 38.1mm × 62.5mm
• Colours: Black, charcoal grey, rusty orange and earthy brown
• 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.