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Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements. Allotropes are different structural modifications of an element: the atoms of the element are bonded together in different manners. For example, the allotropes of carbon include diamond, graphite, graphene, and fullerenes.
Cornwall is a ceremonial county in South West England. It is recognised as one of the Celtic nations and is the homeland of the Cornish people. The county is bordered by the Atlantic Ocean to the north and west, Devon to the east, and the English Channel to the south. The largest settlement is Falmouth, and the county town is Truro.
Tin is a chemical element with the symbol Sn and atomic number 50. A silvery-coloured metal, tin is soft enough to be cut with little force, and a bar of tin can be bent by hand with little effort. When bent, the so-called "tin cry" can be heard as a result of twinning in tin crystals; this trait is shared by indium, cadmium, zinc, and mercury in its solid state.
The carbon group is a periodic table group consisting of carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl). It lies within the p-block.
The Tamar is a river in south west England that forms most of the border between Devon and Cornwall. A part of the Tamar Valley is a World Heritage Site due to its historic mining activities.
Richard Carew was a British translator and antiquary. He is best known for his county history, Survey of Cornwall (1602).
A stannary was an administrative division established under stannary law in the English counties of Cornwall and Devon to manage the collection of tin coinage, which was the duty payable on the metal tin smelted from the ore cassiterite mined in the region. In Cornwall, the duty was passed to the Duchy of Cornwall; in Devon to the Crown.
Toll tin was a term historically used in tin mining in Devon and Cornwall. The holder of a set of tin bounds was required to pay the freeholder of the land on which the bounds had been pitched a portion, called toll tin, of the tin ore extracted.
Black tin is the raw ore of tin, usually cassiterite, as sold by a tin mine to a smelting company. After mining, the ore must be concentrated by several processes to reduce the amount of gangue it contains before it can be sold. It contrasts with white tin, which is the refined, metallic tin produced after smelting.
Geevor Tin Mine, formerly North Levant Mine is a tin mine in the far west of Cornwall, England, between the villages of Pendeen and Trewellard. It was operational between 1911 and 1990 during which time it produced about 50,000 tons of black tin. It is now a museum and heritage centre left as a living history of a working tin mine. The museum is an Anchor Point of ERIH, The European Route of Industrial Heritage. Since 2006, the mine has been part of the UNESCO World Heritage Site Cornwall and West Devon Mining Landscape.
Mining in Cornwall and Devon, in the southwest of Britain, began in the early Bronze Age, around 2150 BC. Tin, and later copper, were the most commonly extracted metals. Some tin mining continued long after the mining of other metals had become unprofitable, but ended in the late 20th century. In 2021, it was announced that a new mine was extracting battery-grade lithium carbonate, more than 20 years after the closure of the last South Crofty tin mine in Cornwall in 1998.
Perranzabuloe is a coastal civil parish and a hamlet in Cornwall, England, United Kingdom. Perranzabuloe parish is bordered to the west by the Atlantic coast and St Agnes parish, to the north by Cubert parish, to the east by St Newlyn East and St Allen parishes and to the south by Kenwyn parish. The hamlet is situated just over a mile (2 km) south of the principal settlement of the parish, Perranporth; the hamlet is also seven miles (11 km) south-southwest of Newquay. Other settlements in the parish include Perrancoombe, Goonhavern, Mount and Callestick. The parish population was 5,382 in the 2001 census, increasing to 5,486 at the 2011 census.
The Loe, also known as Loe Pool, is the largest natural freshwater lake in Cornwall, United Kingdom. The earliest recorded appearance of this simple name form was in 1337, when it was called "La Loo", but is mentioned as 'the lake' in 1302; Situated between Porthleven and Gunwalloe and downstream of Helston, it is separated from Mount's Bay by the shingle bank of Loe Bar. Both the Loe and Loe Bar are situated within the Penrose Estate, which is administered by the National Trust, and are designated as a Site of Special Scientific Interest by Natural England. It is within the Cornwall Area of Outstanding Natural Beauty and is considered a classic Geological Conservation Review Site. The South West Coast Path, which follows the coast of south-west England from Somerset to Dorset passes over Loe Bar.
Tolgus Mount is a village, valley, and district in the parish of Redruth in Cornwall, England, United Kingdom. It is located to the northwest of town of Redruth across the A30 road and falls within the Redruth North ward on Cornwall Council. Historically there were several mines in the area, mining tin and copper.
Tin mining began early in the Bronze Age, as bronze is a copper-tin alloy. Tin is a relatively rare element in the Earth's crust, with approximately 2 ppm, compared to iron with 50,000 ppm.
Burchard Kranich was a mining engineer and physician who came to England from Germany. He was involved in mining ventures in Derbyshire and Cornwall, and in assaying the black ore, thought to be gold-bearing, brought back to England from Baffin Island by Martin Frobisher. He later practised as a physician in London, where he enjoyed a mixed reputation, and is said to have attended Elizabeth I when she contracted smallpox. He is alluded to in several literary works published during the reigns of Elizabeth I and James I.
Compounds of lead exist with lead in two main oxidation states: +2 and +4. The former is more common. Inorganic lead(IV) compounds are typically strong oxidants or exist only in highly acidic solutions.
Fish and Tin and Copper is a traditional folk song/ballad associated with Cornwall, and dealing with the legend of the devil visiting Cornwall and being frightened away, fearing that he'd be made into a Cornish pasty filling.
References
- Chambers's encyclopædia: A dictionary of universal knowledge. 1868. p. 448.
- Blanchard, Ian (2005). Mining, Metallurgy, and Minting in the Middle Ages: Continuing Afro-European Supremacy, 1250-1450. Franz Steiner Verlag. p. 1526. ISBN 9783515087049.
- Carew, Richard (1811). Carew's Survey of Cornwall: To which are added, notes illustrative of its history and antiquities. p. 40.
- Rickard, William (1859). The miner's manual of arithmetic and surveying ...: With a compendium of mensuration and a concise treatise on practical geometry and plane trigonometry; also a course of mine surveying ... Together with levelling and land surveying. p. 38.
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