Black Tourmaline (Schorl) | Wheal Cal, St Just, Cornwall | No. 4

This distinctive natural specimen displays an impressive concentration of deep black Tourmaline crystals across its upper surface, creating a dramatic contrast with the surrounding iron-stained matrix.

The Tourmaline forms tightly intergrown, elongated prismatic crystals, many exhibiting characteristic longitudinal striations and reflective surfaces. Under direct light, the crystals reveal subtle variations in lustre, ranging from satin-black to glossy, almost metallic-looking highlights.

Several particularly well-defined crystal formations are visible across the upper ridge, including thicker, blocky-looking prismatic sections surrounded by smaller interlocking crystals.

Among the dark Tourmaline growth are areas of pale grey to translucent crystalline material, visually consistent with Quartz. These lighter mineral sections appear between and alongside the Tourmaline crystals, providing an attractive contrast.

The underlying matrix displays rich rusty-orange and reddish-brown iron staining, transitioning into pale grey and cream-coloured host rock along the lower edge.

Its naturally angular form and exposed crystalline surface give the specimen a particularly interesting three-dimensional appearance, with different crystal arrangements becoming visible as the piece is rotated.

The combination of dark crystal growth, contrasting pale mineral material and iron-rich staining makes this a compelling specimen for collectors of British minerals and historic Cornish mining localities.

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.