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Grolier Codex
The ''Maya Codex of Mexico'' (MCM) is a Maya screenfold codex manuscript of a pre-Columbian type. Long known as the ''Grolier Codex'' or ''Sáenz Codex'', in 2018 it was officially renamed the ''Códice Maya de México'' (CMM) by the National Institute of Anthropology and History of Mexico. It is one of only four known extant Maya codices, and the only one that still resides in the Americas. The MCM first appeared in a private collection in the 1960s and was shown at "The Maya Scribe and His World", an exhibition held at the Grolier Club in New York City in 1971, hence its former name. An almanac that charts the movements of the planet Venus, it originally consisted of twenty pages; the first eight and the last two are now missing. The greatest height of any of the surviving page fragments is 19 centimeters (7.5 in) of folio 8, and the average page width is 12.5 centimeters (4.9 in). The red frame lines at the bottom of pages four through eight indicates that the dimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grolier Codex, Page 6
Grolier was one of the largest American publishers of general encyclopedias, including ''The Book of Knowledge'' (1910), ''The New Book of Knowledge'' (1966), ''The New Book of Popular Science'' (1972), ''Encyclopedia Americana'' (1945), ''Academic American Encyclopedia'' (1980), and numerous incarnations of a CD-ROM encyclopedia (1986–2003). As an educational publishing company Grolier was known for its presence in school libraries and its in-home encyclopedia sales. It also had a strong presence among parents of children under six years old, the market for Grolier's direct mail-to-the-home business."Acquisition activity in the education market heats up" Heller Report on Educational Technology Markets, Monday, May ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephen D
Stephen or Steven is a common English first name. It is particularly significant to Christians, as it belonged to Saint Stephen ( grc-gre, Στέφανος ), an early disciple and deacon who, according to the Book of Acts, was stoned to death; he is widely regarded as the first martyr (or "protomartyr") of the Christian Church. In English, Stephen is most commonly pronounced as ' (). The name, in both the forms Stephen and Steven, is often shortened to Steve or Stevie. The spelling as Stephen can also be pronounced which is from the Greek original version, Stephanos. In English, the female version of the name is Stephanie. Many surnames are derived from the first name, including Stephens, Stevens, Stephenson, and Stevenson, all of which mean "Stephen's (son)". In modern times the name has sometimes been given with intentionally non-standard spelling, such as Stevan or Stevon. A common variant of the name used in English is Stephan ; related names that have found some curr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maya Death Gods
The Maya death gods, (also Ah Puch, Ah Cimih, Ah Cizin, Hun Ahau, Kimi, or Yum Kimil) known by a variety of names, are two basic types of death gods who are respectively represented by the 16th-century Yucatec deities Hunhau and Uacmitun Ahau mentioned by Spanish Bishop Landa. Hunhau is the lord of the Underworld. Iconographically, Hunhau and Uacmitun Ahau correspond to the Gods A and A' ("A prime"). In recent narratives, particularly in the oral tradition of the Lacandon people, there is only one death god (called "Kisin" in Lacandon), who acts as the antipode of the Upper God in the creation of the world and of the human body and soul. This death god inhabits an Underworld that is also the world of the dead. As a ruler over the world of the dead (''Metnal'' or ''Xibalba''), the principal death god corresponds to the Aztec deity Mictlāntēcutli. The ''Popol Vuh'' has two leading death gods, but these two are really one: Both are called "Death," but while one is known as "One D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maya Numerals
The Mayan numeral system was the system to represent numbers and calendar dates in the Maya civilization. It was a vigesimal (base-20) positional numeral system. The numerals are made up of three symbols; zero (a shell), one (a dot) and five (a bar). For example, thirteen is written as three dots in a horizontal row above two horizontal bars; sometimes it is also written as three vertical dots to the left of two vertical bars. With these three symbols, each of the twenty vigesimal digits could be written. Numbers after 19 were written vertically in powers of twenty. The Maya used powers of twenty, just as the Hindu–Arabic numeral system uses powers of ten. For example, thirty-three would be written as one dot, above three dots atop two bars. The first dot represents "one twenty" or "1×20", which is added to three dots and two bars, or thirteen. Therefore, (1×20) + 13 = 33. Upon reaching 202 or 400, another row is started (203 or 8000, then 204 or 160,000, and so on). The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carmine
Carmine ()also called cochineal (when it is extracted from the cochineal insect), cochineal extract, crimson lake, or carmine lake is a pigment of a bright-red color obtained from the aluminium complex derived from carminic acid. Specific code names for the pigment include natural red 4, C.I. 75470, or E120. ''Carmine'' is also a general term for a particularly deep-red color. Etymology The English word "carmine" is derived from the French word ''carmin'' (12th century), from Medieval Latin ''carminium'', from Persian ''qirmiz'' ("crimson"), which itself derives from Middle Persian ''carmir'' ("red, crimson"). The Persian term ''carmir'' is likely cognate with Sanskrit ''krimiga'' ("insect-produced"), from ''krmi'' ("worm, insect"). The Persian word for "worm, insect" is ''kirm'', and in Iran (Persia) the red colorant carmine was extracted from the bodies of dead female insects such as ''Kermes vermilio'' and cochineal. The form of the term may also have been influen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hematite
Hematite (), also spelled as haematite, is a common iron oxide compound with the formula, Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of . It has the same crystal structure as corundum () and ilmenite (). With this it forms a complete solid solution at temperatures above . Hematite naturally occurs in black to steel or silver-gray, brown to reddish-brown, or red colors. It is mined as an important ore mineral of iron. It is electrically conductive. Hematite varieties include ''kidney ore'', ''martite'' (pseudomorphs after magnetite), ''iron rose'' and ''specularite'' (specular hematite). While these forms vary, they all have a rust-red streak. Hematite is not only harder than pure iron, but also much more brittle. Maghemite is a polymorph of hematite (γ-) with the same chemical formula, but with a spinel structure like magnetite. Large deposits of hematite are found in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbon Black
Carbon black (subtypes are acetylene black, channel black, furnace black, lamp black and thermal black) is a material produced by the incomplete combustion of coal and coal tar, vegetable matter, or petroleum products, including fuel oil, fluid catalytic cracking tar, and ethylene cracking. Carbon black is a form of paracrystalline carbon that has a high surface-area-to-volume ratio, albeit lower than that of activated carbon. It is dissimilar to soot in its much higher surface-area-to-volume ratio and significantly lower (negligible and non-bioavailable) polycyclic aromatic hydrocarbon (PAH) content. However, carbon black can be used as a model compound for diesel soot to better understand how diesel soot behaves under various reaction conditions as carbon black and diesel soot have some similar properties such as particle sizes, densities, and copolymer adsorption abilities that contribute to them having similar behaviours under various reactions such as oxidation experiments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcium Sulfate
Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry. All forms are white solids that are poorly soluble in water.Franz Wirsching "Calcium Sulfate" in Ullmann's Encyclopedia of Industrial Chemistry, 2012 Wiley-VCH, Weinheim. Calcium sulfate causes permanent hardness in water. Hydration states and crystallographic structures The compound exists in three levels of hydration corresponding to different crystallographic structures and to minerals: * (anhydrite): anhydrous state. The structure is related to that of zirconium orthosilicate (zircon): is 8-coordinate, is tetrahedral, O is 3-coordinate. * (gypsum and selenite (mineral)): dihydrate. * (bassanite): hemihydrate, also known as plaster of Paris. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gypsum
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and drywall. Alabaster, a fine-grained white or lightly tinted variety of gypsum, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It forms as an evaporite mineral and as a hydration product of anhydrite. The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison. Etymology and history The word ''gypsum'' is derived from the Greek word (), "plaster". Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amate
Amate ( es, amate from nah, āmatl ) is a type of bark paper that has been manufactured in Mexico since the precontact times. It was used primarily to create codices. Amate paper was extensively produced and used for both communication, records, and ritual during the Triple Alliance; however, after the Spanish conquest, its production was mostly banned and replaced by European paper. Amate paper production never completely died, nor did the rituals associated with it. It remained strongest in the rugged, remote mountainous areas of northern Puebla and northern Veracruz states. Spiritual leaders in the small village of San Pablito, Puebla were described as producing paper with "magical" properties. Foreign academics began studying this ritual use of amate in the mid-20th century, and the Otomi people of the area began producing the paper commercially. Otomi craftspeople began selling it in cities such as Mexico City, where the paper was revived by Nahua painters in Guerrero to c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palygorskite
Palygorskite or attapulgite is a magnesium aluminium phyllosilicate with the chemical formula ) that occurs in a type of clay soil common to the Southeastern United States. It is one of the types of fuller's earth. Some smaller deposits of this mineral can be found in Mexico, where its use is tied to the manufacture of Maya blue in pre-Columbian times. Name Palygorskite was first described in 1862 for a deposit at Palygorskaya on the Popovka River, Middle Urals, Permskaya Oblast, Russia. The synonym ''attapulgite'' is derived from the U.S. town of Attapulgus, in the extreme southwest corner of the state of Georgia, where the mineral is abundant and surface-mined. Mining and usage Mineral deposit in the US Two companies are involved in the industrial extraction and processing of gellant-grade attapulgite clay within the same Attapulgus deposit: Active Minerals International, LLC, and BASF Corp. In 2008, BASF acquired the assets of Zemex Attapulgite, leaving only two gellan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maya Blue
Maya blue ( es, azul maya) is a unique bright azure blue pigment manufactured by cultures of pre-Columbian Mesoamerica, such as the Mayans and Aztecs. Manufacture The Maya blue pigment is a composite of organic and inorganic constituents, primarily indigo dyes derived from the leaves of anil (''Indigofera suffruticosa'') plants combined with palygorskite, a natural clay which is not known to exist in abundant deposits in Mesoamerica. Smaller trace amounts of other mineral additives have also been identified. Historical use Maya blue first appeared around 800, and it was still used in the 16th century in several Convents of Colonial Mexico, notably in the paintings of the Indian Juan Gerson in Tecamachalco. These paintings are a clear example of the combination of Indian and European techniques sometimes known as '' Arte Indocristiano''. After that, the techniques for its production were lost in Mexico, but in Cuba there are examples from as late as 1830. Resistance to weathe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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