Brass is an alloy of copper (Cu) and zinc (Zn), in proportions which can be varied to achieve different colours and mechanical, electrical, acoustic, and chemical properties, but copper typically has the larger proportion. In use since prehistoric times, it is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.
Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals and sometimes non-metals, such as phosphorus, or metalloids such as arsenic or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties, such as strength, ductility, or machinability.
A coin is a small object, usually round and flat, used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order to facilitate trade. They are most often issued by a government. Coins often have images, numerals, or text on them. The faces of coins or medals are sometimes called the obverse and the reverse, referring to the front and back sides, respectively. The obverse of a coin is commonly called heads, because it often depicts the head of a prominent person, and the reverse is known as tails.
The peseta was the currency of Spain between 1868 and 2002. Along with the French franc, it was also a de facto currency used in Andorra.
Cupronickel or copper–nickel (CuNi) is an alloy of copper with nickel, usually along with small quantities of other elements added for strength, such as iron and manganese. The copper content typically varies from 60 to 90 percent.
Orichalcum or aurichalcum is a metal mentioned in several ancient writings, including the story of Atlantis in the Critias of Plato. Within the dialogue, Critias says that orichalcum had been considered second only to gold in value and had been found and mined in many parts of Atlantis in ancient times, but that by Critias's own time, orichalcum was known only by name.
The eagle was a United States $10 gold coin issued by the United States Mint from 1795 to 1933.
The Coinage Act of 1792, passed by the United States Congress on April 2, 1792, created the United States dollar as the country's standard unit of money, established the United States Mint, and regulated the coinage of the United States. This act established the silver dollar as the unit of money in the United States, declared it to be lawful tender, and created a decimal system for U.S. currency.
The fineness of a precious metal object represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost of high-purity refinement. For example, copper is added to the precious metal silver to make a more durable alloy for use in coins, housewares and jewelry. Coin silver, which was used for making silver coins in the past, contains 90% silver and 10% copper, by mass. Sterling silver contains 92.5% silver and 7.5% of other metals, usually copper, by mass.
The real was a unit of currency in Spain for several centuries after the mid-14th century. It underwent several changes in value relative to other units throughout its lifetime until it was replaced by the peseta in 1868. The most common denomination for the currency was the silver eight-realSpanish dollar or peso which was used throughout Europe, America and Asia during the height of the Spanish Empire.
The maravedí or maravedi, , was the name of various Iberian coins of gold and then silver between the 11th and 14th centuries and the name of different Iberian accounting units between the 11th and 19th centuries.
The real was the official currency of Gibraltar until 1825 and continued to circulate alongside other Spanish and British currencies until 1898.
The silver real was the currency of the Spanish colonies in America and the Philippines. In the seventeenth century the silver real was established at two billon reales or sixty-eight maravedíes. Gold escudos were also issued. The coins circulated throughout Spain's colonies and beyond, with the eight-real piece, known in English as the Spanish dollar, becoming an international standard and spawning, among other currencies, the United States dollar. A reform in 1737 set the silver real at two and half billon reales or eighty-five maravedís. This coin, called the real de plata fuerte, became the new standard, issued as coins until the early 19th century. The gold escudo was worth 16 reales de plata fuerte.
The National Mint of Xuvia was a Spanish mint of copper coins from 1812 to 1868.
Silver standards refer to the standards of millesimal fineness for the silver alloy used in the manufacture or crafting of silver objects. This list is organized from highest to lowest millesimal fineness, or purity of the silver.
This article provides an outline of the currency of Spanish America from Spanish colonization in the 15th century until Spanish American independencies in the 19th. This great realm was divided into the Viceroyalty of New Spain, which came to include all Spanish territory north of Panama, the West Indies, Venezuela, and the Philippines, and the Viceroyalty of Peru, which included Panama and all Spanish territory in South America except Venezuela. The monetary system of Spanish America, originally identical to that of Spain, soon diverged and took on a distinctive character of its own, which it passed on to the independent nations that followed after.
Billon is an alloy of a precious metal with a majority base metal content. It is used chiefly for making coins, medals, and token coins.
The dobla, including dobla castellana (excelente), gran dobla, dobla de la Banda, dobla cruzada, dobla alfonsi and dobla almohade, was the name of various Iberian gold coins between the 11th and 16th centuries, ranging in value from 2-870 maravedis, depending on the year. The name originated as the "double maravedi", a term used by Castilians for the Muslim dinar, when the maravedí was re-valued as equivalent to the Muslim half-dinar, or masmudina, by Ferdinand III. However, years later, the dobla became various new coins, and at times, a dobla was the same as the newer coins enrique or castellano. In general, a dobla was a valuable gold coin, while the maravedi was de-valued into silver or rarely copper forms. In the 16th century, the dobla was replaced by the ducado, then by the escudo as the standard gold coin of Spain.
Chinese coinage in the Ming dynasty saw the production of many types of coins. During the Ming dynasty of China, the national economy was developed and its techniques of producing coinage were advanced.
Qing dynasty coinage was based on a bimetallic standard of copper and silver coinage. The Manchu-led Qing dynasty was established in 1636 and ruled over China proper from 1644 until it was overthrown by the Xinhai Revolution in 1912. The Qing dynasty saw the transformation of a traditional cash coin based cast coinage monetary system into a modern currency system with machine-struck coins, while the old traditional silver ingots would slowly be replaced by silver coins based on those of the Mexican peso. After the Qing dynasty was abolished its currency was replaced by the Chinese yuan of the Republic of China.
