Herodsfoot is the Cornish bournonite locality by which other classic bournonites are judged. The mine produced the celebrated “cogwheel” habit: tabular, repeatedly twinned, metallic grey to gunmetal crystals whose striated edges resemble toothed wheels. The finest pieces combine sculptural, dark bournonite with milky to glassy quartz, sometimes with siderite, pyrite, chalcopyrite, galena, or tetrahedrite-subgroup minerals. For the serious collector, the name Herodsfoot does not simply mean “Cornish bournonite”; it means a narrow historical window of world-class specimens, most of them raised in the mid-19th century and dispersed through old British, European, American, and Australian collections.
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The appeal is both visual and historical. Herodsfoot bournonite is usually heavy, dark, and architectural rather than brightly colored; its beauty lies in form, luster, and age. The best crystals show bright metallic faces, deep ribbing, complex twinning, and the unmistakable cogwheel outline. Many sit in or on quartz, and the contrast of white quartz against dark sulphosalt is one of the visual signatures of the mine. A Herodsfoot specimen with clean, freestanding wheels, documented old provenance, and minimal repair occupies a special place in a British suite.
Geologically, Herodsfoot belongs to the lead-silver-antimony vein mineralization of south-east Cornwall. The principal lode lay west of the village in the West Looe River valley and was worked primarily for argentiferous galena. Bournonite, PbCuSbS3, and tetrahedrite-group minerals were not the bulk economic product, but they made the locality famous. The deposit is a north-striking, steep vein system with quartz, siderite, pyrite, galena, sphalerite, baryte, dolomite, chalcopyrite, bournonite, and tetrahedrite-group minerals in its recorded assemblage. Secondary lead minerals such as cerussite and pyromorphite occurred in the shallower oxidized parts.
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Historically, Herodsfoot’s collector fame is inseparable from Richard Talling, the Lostwithiel mineral dealer who acquired specimens from miners and placed them into major collections. His handling of the Herodsfoot bournonites helped turn a relatively small Cornish lead-silver mine into an international mineral name. Many surviving top specimens carry old collection histories: Talling, British Museum/Natural History Museum, Henry Ludlam, Royal Institution of Cornwall, Albert Chapman, and other classic names recur in the trail.
Collectors look for four things first: unmistakable cogwheel twinning, crisp metallic luster, honest old provenance, and condition. Herodsfoot bournonite is soft and brittle, and many old pieces show edge wear, contact damage, repairs, or quartz overgrowth partly hiding crystals. Fine condition is therefore rare. A miniature with one sharp, lustrous wheel can be far more desirable than a larger but battered mass; a small cabinet piece with several exposed, intact wheels on quartz can be a centerpiece.
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Search for specimens: View all bournonite specimens from Herodsfoot Mine, Cornwall, UK
Herodsfoot Mine, also referred to as North Herodsfoot Mine, lies near Lanreath in the Liskeard district of south-east Cornwall, in the steep wooded valley system of the West Looe River. The mine’s recorded position is close to SX 212 600, and the village of Herodsfoot sits several miles southwest of Liskeard and north of Looe.
The deposit is a lead-silver-antimony vein system. The main Herodsfoot lode trends roughly north-south and was exploited for more than a kilometre along strike. It is generally described as a steep to sub-vertical vein or crosscourse-style structure carrying quartz, siderite, pyrite, and argentiferous galena, with sphalerite, baryte, and dolomite in vughs and accessory sulphosalts including bournonite and tetrahedrite-group minerals. The bournonite is the collector’s glory of the mine; the working ore was principally lead with silver.
Mining at Herodsfoot goes back well before the classic specimen period. The lode had been worked by the early 1700s, and the mine was reopened in 1844 after a period of closure. When reopened, older workings were reportedly already hundreds of feet deep. The main deep-mining period ran through the 1840s to the 1880s, with Herodsfoot finally closing in the mid-1880s. During that working life the mine reached great depth for a Cornish lead-silver mine, with later accounts giving a depth of 215 fathoms, or about 1,290 feet.
The peak collector period for bournonite was narrower than the mine’s industrial life. The finest “cogwheel ore” specimens are associated especially with the 1850s through early 1870s, and many dealer and museum descriptions refer to the classic production window as about 1850–1875 or, more tightly for the very best preserved historic pieces, the 1860s. The mine also produced famous tetrahedrite-group specimens, sometimes coated or associated with chalcopyrite, and these sit beside bournonite as the great Herodsfoot classics.
Collecting access is not a casual matter. The old mine site and dumps are private, wooded, historically complex, and potentially hazardous. Shafts, flooded workings, unstable masonry, concealed collapses, contaminated mine waste, and steep ground all require caution. Modern accounts from the site emphasize arranged group visits and permission-based searching rather than open public collecting. Any collector considering a visit should treat Herodsfoot as a heritage and safety-sensitive locality: obtain landowner permission, avoid shafts and underground openings, and do not assume that old mine dumps are free for removal.
The dumps have been of interest because they remained comparatively undisturbed for a long period after closure, but expectations should be realistic. The famous specimens were not casual dump finds of the modern era; they were recovered from productive underground vughs during active mining and were rapidly absorbed into the 19th-century specimen trade. Modern dump material may yield quartz with massive bournonite, pyrite, galena, siderite, or other remnants, but sharp cabinet-quality cogwheels are historic pieces, not a reasonable modern field expectation.
Herodsfoot bournonite is classic orthorhombic bournonite in its most collectible habit: tabular crystals repeatedly twinned into cogwheel or cruciform forms. The wheels may appear as thick, ribbed, metallic blades joined in parallel growth, or as more isolated twinned crystals standing on quartz. The best examples show bright steel-grey to gunmetal faces, deep edge striations, and strong relief against pale quartz.
Color ranges from silvery grey through gunmetal to darker lead-grey or blackish metallic surfaces. Some specimens show subtle iridescence or a natural patina; overly bright, smooth, or unnatural surfaces should be examined carefully. Luster can be excellent, but many old examples have dulled faces, oxidation, or minor bruising. The locality’s aesthetic is rarely “flashy” in a modern Chinese or Bolivian sense; it is disciplined, metallic, historic, and structural.
The recorded crystal sizes are exceptional for the species. Mindat’s occurrence data for Herodsfoot record bournonite crystals to 11 cm and cogwheels to 6 cm, while classic specimen descriptions commonly cite individual wheels in the 1–4 cm range on miniatures and small cabinet pieces. The Australian Museum’s celebrated Chapman specimen measures 6.5 x 9 x 5 cm and is noted for large silvery cogwheel crystals. Dealer descriptions of fine miniatures often emphasize a main crystal around 2–4 cm across, which is already very significant for Herodsfoot material when condition is good.
Quartz is the most typical and most desirable matrix. Herodsfoot quartz may be milky, drusy, mounded, or more lustrous and crystalline; it can partly cover or obscure the bournonite, creating a very characteristic old-Cornish look. Siderite is also a recurring gangue mineral, and pyrite may appear as stringers, coatings, or small crystals. Other recorded associates include galena, sphalerite, chalcopyrite, baryte, dolomite, tetrahedrite-group minerals, cerussite, pyromorphite, linarite, malachite, anglesite, and several rarer sulphosalts recorded in the broader mine assemblage.
Quality is judged by exposed geometry. The most desirable Herodsfoot specimens show at least one clean, readable cogwheel with sharp edge “teeth,” natural metallic faces, and minimal distracting quartz overgrowth. Multiple wheels on matrix are especially desirable when they display from a single viewing angle. Pieces composed mainly of massive bournonite are historically interesting, but they are less desirable unless they carry sharp exposed crystals.
A genuine Herodsfoot “look” usually combines dark cogwheel crystals, quartz matrix, old patina, and a 19th-century provenance trail. A specimen with a modern label but no history may still be real, but old labels matter here more than for many localities. Herodsfoot’s classic production ended long ago, and provenance is part of both the scientific and market value.
Herodsfoot bournonite is scarce on the market, and fine specimens are genuinely rare. Ordinary examples appear occasionally as miniatures with one or more partial cogwheels, often with quartz. Strong miniatures and small cabinet specimens with sharp main crystals are expensive; top historic pieces are museum-grade and may pass privately rather than appear in routine dealer inventory. The locality has enough name recognition that even damaged or partly concealed examples can command strong interest if the crystallography is evident.
The main authenticity concern is not a flood of fabricated Herodsfoot fakes, but the mixture of age, value, and fragility. Bournonite has low hardness, brittle tenacity, and vulnerable projecting edges. Reattached wheels, repaired matrix, glued contacts, and old restorations are all plausible. A good repair is acceptable if disclosed, but it should be priced accordingly. Check under magnification for glossy glue lines, mismatched striations across a break, suspiciously clean contact points, and matrix that does not visually or mineralogically belong.
Be alert for assembled “marriages,” especially single bournonite crystals or broken wheels mounted on unrelated quartz. Natural Herodsfoot specimens usually show believable contact relationships: quartz growing around the bournonite, bournonite partly embedded in quartz, or crystals emerging from a coherent sulphide-rich matrix. A crystal perched on a matrix surface with a narrow, shiny, uniform junction deserves close scrutiny.
Condition issues are common. Edge bruising on cogwheel teeth, broken terminations, scuffed metallic faces, and quartz overgrowth hiding part of the crystal are normal realities of the locality. Do not reject every imperfect piece; instead, judge whether the main display face carries the specimen. A Herodsfoot bournonite can have peripheral damage and still be important if the principal wheel is sharp and the damage is not visible from the intended display angle.
Chemical cleaning can harm bournonite. Aggressive acid work may dull metallic luster, leave granular or etched faces, or produce an unnatural contrast between stripped matrix and tired sulphosalt. The best Herodsfoot pieces retain an old, integrated surface: not dirty in the careless sense, but naturally patinated and visually coherent.
Labels and provenance are unusually important. Names such as Richard Talling, Ludlam, British Museum/Natural History Museum, Royal Institution of Cornwall, Albert Chapman, George Elling, Richard Kosnar, Malcolm Southwood, or other documented collections can materially affect value. If a specimen is represented as a 19th-century Herodsfoot piece, ask for images of labels, accession numbers, publication references, or prior sale records. For a high-value purchase, provenance should be treated as part of the specimen, not as decoration.
In 1858, Herodsfoot bournonite burst from a working lead-silver mine into the world of serious mineral collecting. The Virtual Microscope record for the Royal Cornwall Museum describes spectacular cogwheel bournonites being found that year at Herodsfoot, a lead and silver mine a few miles east of Lostwithiel. Richard Talling, already a Lostwithiel dealer with a keen eye for specimens, acquired the best pieces from local miners and sold them onward to collectors and museums. One Royal Institution of Cornwall specimen, now recorded as TRURI:801.908, was almost certainly part of a December 1858 purchase from Talling; the whole group cost £8.10s. That figure is now a wonderful historical compression: a modest Victorian invoice for material that helped define a species in the eyes of collectors worldwide.
The most famous Herodsfoot story has a long afterlife. The Australian Museum’s Chapman specimen, D.50188, was collected by Richard Talling sometime between 1858 and 1868 from a vugh in the upper levels of the Herodsfoot Lead Mine. It later went to the British Museum. Albert Chapman saw it there in 1973, when the institution was still the British Museum of Natural History, and began trying to acquire it. The Museum resisted. Chapman persisted. The exchange finally happened only after the Keeper of Minerals saw the quality of the specimens Chapman was offering in return, including Broken Hill alabandite and Tasmanian crocoite. Today the specimen sits in the Australian Museum as part of the Albert Chapman Collection, registered in 1996, measuring 6.5 x 9 x 5 cm: a Cornish vugh, a Victorian dealer, a British national collection, an Australian collector, and a transcontinental trade all folded into one glittering group of cogwheels.
Herodsfoot’s industrial story is equally vivid. The old Engine Shaft was already part of the earlier mine sett and is described by the modern North Herodsfoot Mine notes as probably begun in the 1700s. When the mine restarted in 1844 it was found to be 50 fathoms deep; eventually it reached 150 fathoms. It served for pumping, hauling ore, and as a ladder way for men. There was no recorded adit on the mine. The shaft is now flooded to ground level, and the surrounding deads have slumped over time, giving it what the site owner aptly called an “awesome appearance.” After heavy rain, the water level can rise two metres in a very short time. That detail is worth remembering: Herodsfoot is not merely an old label on a specimen. It is a wet, unstable, wooded Cornish mine site with deep voids still breathing beneath the leaves.
The site also preserves the strange afterlife of mine buildings. The Russell Society account notes that the mine buildings still retained their roofs in 1954, and that the boiler house was still near perfect in 1983. The Delabole slates were removed only in 1996 to re-roof the Count House. Today the dumps are carpeted in leaf mould and trees, and preservation work has focused on stabilizing buildings, understanding the geology and mineralization, and trying to locate old workings. It is a quiet agricultural and wooded place now, but the specimen record still carries the noise of pumps, dressing floors, carts, and dealers waiting for the next vugh to be opened.
Even the modern dump material tells a scaled-down version of the great story. A North Herodsfoot Mine post from 2012 describes a quartz specimen weighing around 20 kg, made of hard compact iron-stained quartz with massive bournonite as the grey mineral and stringers of pyrite. It was “a little large for the specimen drawer.” That is not a museum cogwheel, but it is exactly the kind of field detail that brings the locality back to earth: the famous species was not only born as perfect wheels on white quartz, but also as heavy, stubborn, sulphide-rich vein material hauled from a Cornish lode.
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