Although female roles were performed by castrati in some of the papal states, this was increasingly rare ; by 1680, they had supplanted " normal " male voices in lead roles, and retained their position as primo uomo for about a hundred years ; an Italian opera not featuring at least one renowned castrato in a lead part would be doomed to fail.

Although this is a relatively rare instance of a female Confucian voice, Ban Zhao almost entirely accepts the prevailing views concerning women's proper roles ; they should be silent, hard-working, and compliant.

Isidore of Miletus and Anthemius of Tralles originally planned on a main hall of the Hagia Sophia that measured 230 feet by 250 feet, making it the largest church in Constantinople, but the original dome was nearly 20 feet lower than it was constructed, “ Justinian suppressed these riots and took the opportunity of marking his victory by erecting in 532-7 the new Hagia Sophia, one of the largest, most lavish, and most expensive buildings of all time .” Although Isidore of Miletus and Anthemius of Tralles were not formally educated in architecture, they were scientists that could organize the logistics of drawing thousands of laborers and unprecedented loads of rare raw materials from around the Roman Empire to create the Hagia Sophia for Emperor Justinian I.

Although carbonaceous chondrites are thought to be rare, some are very large and the suspected " dinosaur-killer " may have been a carbonaceous chondrite.

Although lanthanum belongs to the element group called rare earth metals, it is not rare at all.

Although its FPU performance fit scientific users quite well, its limited integer performance and high cost dampened appeal for most users, and the R8000 was in the marketplace for only a year and remains fairly rare.

Although neon is a very common element in the universe and solar system ( it is fifth in cosmic abundance after hydrogen, helium, oxygen and carbon ), it is very rare on Earth.

Although neodymium is classed as a " rare earth ", it is no rarer than cobalt, nickel, and copper ore, and is widely distributed in the Earth's crust.

Although it belongs to the rare earth metals, neodymium is not rare at all.

Although rare now, in the past there were bowlers who used the off-break action who deliberately did not impart any considerable spin on the ball but relied on line and length to frustrate batsmen.

Although in practice such instances are rare, they do exist.

Although encountering the flaw was extremely rare in practice ( Byte magazine estimated that 1 in 9 billion floating point divides with random parameters would produce inaccurate results ),< ref > both the flaw and Intel's initial handling of the matter were heavily criticized.

Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth's crust and is more common than such metals as tin.

Although in rare cases, a court may change the terms of the trust due to unexpected changes in circumstances that make the trust uneconomical or unwieldy to administer, under normal circumstances an irrevocable trust may not be changed by the trustee or the beneficiaries of the trust.

Although the acute porphyrias may cause episodes of confusion and psychiatric disturbance, dementia is a rare feature of these rare diseases.

Although plantain and banana allergy is not among the top five food allergies, it cannot be considered as a rare allergy, neither in children nor in adults.

Although the standards permit any type of environment, it is fairly rare to see low level languages like C used.

Although rare, such cases do exist and may sometimes be referred to as mixed-endian or middle-endian.

Although the great white is typically regarded as an apex predator in the wild, it is in rare cases preyed upon by the larger orca ( also known as the killer whale ).

Although corals first appeared in the Cambrian period, some, fossils are extremely rare until the Ordovician period, 100 million years later, when rugose and tabulate corals became widespread.

Although < sup > 4 </ sup > He continues to be produced by other mechanisms ( such as stellar fusion and alpha decay ) and trace amounts of < sup > 1 </ sup > H continue to be produced by spallation and certain types of radioactive decay ( proton emission and neutron emission ), most of the mass of these isotopes in the universe, and all but the insignificant traces of the < sup > 3 </ sup > He and deuterium in the universe produced by rare processes such as cluster decay, are thought to have been produced in the Big Bang.

Although helium-3 was found to be about 10, 000 times rarer than helium-4 in the helium from the gas wells, its significant presence in underground gas deposits implied that either it did not decay, or else it had a very long half-life-billions of years.

Although steep mountain terrain makes exploitation difficult, mineral surveys have found small deposits of limestone, magnesite, zinc, copper, iron, mica, lead, and cobalt.

Although deposits of graphite had been found in other parts of the world, they were not of the same purity and quality as the Borrowdale find, and had to be crushed to remove the impurities, leaving only graphite powder.

Although plenty of placer gold was found there, gold-bearing quartz deposits were discovered in 1851 and mining those deposits for gold became the mainstay of the local economy for many years.

Although no gold was found in the Ely area, large deposits of iron ore were.

Although Section 21 of the Glass – Steagall Act was directed at preventing securities firms ( particularly traditional private partnerships such as J. P. Morgan & Co .) from accepting deposits, it prevented any firm that accepted deposits from underwriting or dealing in securities ( other than “ bank-eligible securities ” after the 1935 Banking Act ’ s “ clarification ”).

Although primarily dealing with the savings and loan crisis, CEBA also established a moratorium to March 1, 1988, on banking regulator actions to approve bank or affiliate securities activities, applied the affiliation restrictions of Glass-Steagall Sections 20 and 32 to all FDIC insured banks during the moratorium, and eliminated the “ nonbank bank ” loophole for new FDIC insured banks ( whether they took only deposits or made only commercial loans ) except industrial loan companies.

Although weak and crumbly, these volcanic deposits have enough cohesion to allow them to stand in vertical faces and develop large subterranean voids within them.

Although the presence of coal deposits in the district was well known and limited amounts of it had been recovered in Roman times, it was not practicable to use it for iron making with the methods of smelting then in use.

Although they are found only in marine deposits, their oxygen isotope values indicate that they consumed water with a range of degrees of salinity, some specimens showing no evidence of sea water consumption and others none of fresh water consumption at the time when their teeth were fossilized.

Although simple methods such as panning are still used, some methods use suction pumps — a practice involving turning over deposits of sediment and spreading them in order to find gold.

Although " drift " strictly refers to glacial and fluvio-glacial deposits, the term on geological maps has traditionally included other material including alluvium, river terraces, etc.

Although the deposits within the broch had been badly disturbed by earlier attempts, this work revealed a complex sequence of construction from different periods.

Although the abiogenic hypothesis was accepted by many geologists in the former Soviet Union, it fell out of favor at the end of the 20th century because it never made any useful prediction for the discovery of oil deposits.

Although mining, based on polymetallic deposits of zinc, gold, and silver, makes a small contribution to Chile ’ s total mining GDP, it is significant in regional exports.

Although much of the oil was discovered on land given to Afrikaans settlers, they could not benefit directly from the discovery due to Argentinian law which decrees that all mineral deposits belong to the state.

Although by early 15th century most of the gold deposits were depleted, the town started to gain significant income from the nearby Via Regia road linking Breslau ( Wrocław ) with Leipzig.

Although these sites had been used since Roman times William Smith developed new methods for the identification of deposits of Fuller's earth to the south of Bath.

Although they are found only in marine deposits, their oxygen isotope values indicate that they consumed a range of water with different degree of salinity, with some specimens having no evidence of sea water consumption and others that did not ingest fresh water at the time when their teeth are fossilized.

Although greensand has been found throughout Phanerozoic and Late Precambrian sedimentary deposits, it appears to be most common in Eocene, Cambrian, and Cretaceous sedimentary deposits for unknown reasons.

Although the asbestos mine is the biggest producer of the mineral in Zvishavane, platinum, gold, beryl, chromite iron ore at Buchwa and recently discovered huge deposits of diamond at Murowa are also mined in the area.