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The Pearson symbol, or Pearson notation, is used in crystallography as a means of describing a crystal structure. [1] It was originated by William Burton Pearson and is used extensively in Pearson's handbook of crystallographic data for intermetallic phases. [2] The symbol is made up of two letters followed by a number. For example: Diamond ...
In crystallography, a crystallographic point group is a three dimensional point group whose symmetry operations are compatible with a three dimensional crystallographic lattice. According to the crystallographic restriction it may only contain one-, two-, three-, four- and sixfold rotations or rotoinversions. This reduces the number of ...
For example, symbols P 6 m2 and P 6 2m denote two different space groups. This also applies to symbols of space groups with odd-order axes 3 and 3. The perpendicular symmetry elements can go along unit cell translations b and c or between them. Space groups P321 and P312 are examples of the former and the latter cases, respectively.
The largest lacewing is the Australian "blue eyes lacewing" (Nymphes myrmeleonides), which can measure up to 4 cm (1.6 in) in length and span 11 cm (4.3 in) across the wings. [41] Some forms of this ancient order could grow extremely large during the Jurassic period and may have ranked among the largest insects ever. [42]
Cryo bio-crystallography; Crystal chemistry; Crystal engineering; Crystal field excitation; Crystal cluster; Crystal growth; Crystal habit; Crystal model; Crystal optics; Crystal polymorphism; Crystal structure; Crystal structure of boron-rich metal borides; Crystal structure of boron-rich metal borides (data page) Crystal structure prediction ...
Crystallography is the branch of science devoted to the study of molecular and crystalline structure and properties. [1] The word crystallography is derived from the Ancient Greek word κρύσταλλος ( krústallos ; "clear ice, rock-crystal"), and γράφειν ( gráphein ; "to write"). [ 2 ]
A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...
In geometry, a point group is a mathematical group of symmetry operations (isometries in a Euclidean space) that have a fixed point in common. The coordinate origin of the Euclidean space is conventionally taken to be a fixed point, and every point group in dimension d is then a subgroup of the orthogonal group O(d).