Ultra Rare Turquoise Gunheath China Clay Mine Cornwall UK Mineral Specimen COA

Description

Ultra Rare Cornish Turquoise Mineral Specimen

This is an ultra rare Turquoise specimen from Gunheath China Clay Mine, St Austell, Cornwall, England, offered as a genuine mineral specimen with a fully hand-signed Premium Certificate of Authenticity. Cornish Turquoise is a highly desirable locality mineral, especially for collectors of British minerals, Cornish mining specimens, phosphate minerals and unusual UK gemstone material. This piece has been carefully chosen for its locality significance, colour and display appeal, and the photo shows the actual specimen you will receive.

Geology and Mineral Information

Turquoise is a hydrated copper aluminium phosphate mineral, with the ideal chemical formula CuAl₆(PO₄)₄(OH)₈·4H₂O. It belongs to the triclinic crystal system and most often occurs as compact, massive, earthy, nodular, vein-like or crust-forming material rather than as well-formed visible crystals. Its colour is typically blue, blue-green, greenish blue or pale green, with the exact shade influenced by copper, aluminium, iron content and the geological conditions present during formation.

At Gunheath China Clay Mine, Turquoise is associated with the mineral-rich environment of the St Austell granite district. The area is best known for china clay, or kaolin, which formed through extensive alteration of granite. This alteration created complex chemical conditions in which phosphate minerals could develop in suitable cavities, seams, fractures and altered zones within the granitic host rock.

Locality: Gunheath China Clay Mine, St Austell, Cornwall

Gunheath China Clay Mine lies within the famous St Austell china clay area of Cornwall, one of the most important kaolin-producing districts in Britain. The local geology is closely linked with the Cornubian granite batholith, a major granitic body formed during the late stages of Variscan geological activity. Over time, hydrothermal alteration and weathering affected the granite, producing kaolin deposits and a distinctive suite of secondary minerals.

This Turquoise specimen represents an uncommon and collectable mineral occurrence from that setting. Cornish Turquoise is not a mass-market material and is generally encountered in small quantities, making genuine specimens from the Gunheath locality especially appealing to collectors who focus on UK minerals, Cornish mining history or unusual phosphate mineralogy.

Colour, Texture and Display Appeal

This specimen displays the attractive colour character for which Turquoise is known, with blue to blue-green tones that make it visually appealing as a display mineral. Depending on the individual surface and matrix, Turquoise may show a waxy, earthy or slightly granular appearance, sometimes occurring with pale host rock or quartz-rich material from the altered granite environment.

As a natural mineral specimen, variations in colour, texture, surface detail and matrix are part of its geological character. These natural features help make each specimen unique and are valued by collectors who appreciate authentic locality pieces rather than mass-produced decorative items.

Authenticity and Presentation

This is a genuine Turquoise mineral specimen from Gunheath China Clay Mine, St Austell, Cornwall, England. It includes a fully hand-signed Premium Certificate of Authenticity, giving added confidence for collectors, gift buyers and anyone building a labelled mineral collection. Full sizing is shown in the photo, and the images show the exact specimen you will receive.

This piece would make an excellent addition to a British mineral collection, Cornish mining display, phosphate mineral suite, geology cabinet, educational collection or carefully chosen gift for a mineral enthusiast. It is a rare and attractive example of Cornish Turquoise from one of the UK’s most distinctive mineral-producing regions.