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HEXAGONAL SYSTEM [10 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-02-12

English

Subject field(s)
  • Mineralogy

French

Domaine(s)
  • Minéralogie
DEF

Système cristallin dont deux des trois axes sont de longueur égale (a = b), formant entre eux un angle de 120° dans le même plan; le troisième axe (c), perpendiculaire à ce plan, est de longueur différente.

OBS

Pour être hexagonal, un cristal doit posséder un axe de symétrie d'ordre 6.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

[Sistema cristalino que consta de un] prima recto de base hexagonal [que] tiene un eje principal entre el centro de ambas bases y seis ejes, iguales tres a tres, que forman ángulos de 90° con aquél y de 30° entre ellos[,] tiene un centro y 7 planos de simetría.

Save record 1

Record 2 2016-02-11

English

Subject field(s)
  • Mineralogy
DEF

Mineral composed of an alloy of osmium (50-80%) and iridium (20-50%).

CONT

... alloys composed of more osmium than iridium are called siserskite. Both iridosmine and siserskite crystallize in the hexagonal system.

Key term(s)
  • syserskite

French

Domaine(s)
  • Minéralogie
DEF

Osmiure naturel d'iridium.

Spanish

Campo(s) temático(s)
  • Mineralogía
OBS

Variedad de iridosmina.

Save record 2

Record 3 - external organization data 2012-10-04

English

Subject field(s)
  • Chemistry
  • Geochemistry
  • Compartment - Canadian Nuclear Safety Commission
Universal entry(ies)
Te
symbol
13494-80-9
CAS number
DEF

A silvery-white, lustrous, orthorhombic or hexagonal metallic element in group VI of the periodic system which is occasionally found in native form.

OBS

tellurium: form recommended by the IUPAC (International Union of Pure and Applied Chemistry) for the systematic name corresponding to the CAS number indicated on the present record; term adopted by Environment Canada, used in the list of pollutants measured in the National Air Pollution Surveillance Network (NAPS).

French

Domaine(s)
  • Chimie
  • Géochimie
  • Tiroir - Commission canadienne de sûreté nucléaire
Entrée(s) universelle(s)
Te
symbol
13494-80-9
CAS number
DEF

Métalloïde rare de la famille du soufre, du système cristallin rhomboédrique.

CONT

Tellure. Sous la forme cristalline, il est d'apparence argentée et présente l'éclat métallique. C'est un métal cassant et facilement pulvérisable. Il apparaît sous la forme amorphe par précipitation à partir d'une solution d'acide tellureux ou tellurique.

OBS

[Le tellure] existe à l'état natif, en cristaux blanc vif, du système cristallin hexagonal. Il est surtout associé à des éléments chalcophiles (Au, Ag, Hg) avec lesquels il forme des tellurures. Élément de numéro atomique 52; masse atomique 127,61. Symbole : Te.

OBS

tellure : forme recommandée par l'UICPA (Union internationale de chimie pure et appliquée) pour le nom systématique correspondant au numéro CAS indiqué sur la présente fiche; terme retenu par Environnement Canada, utilisé dans la liste des polluants mesurés par le Réseau national de surveillance de la pollution atmosphérique (RNSPA).

Spanish

Campo(s) temático(s)
  • Química
  • Geoquímica
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
Entrada(s) universal(es)
Te
symbol
13494-80-9
CAS number
OBS

Elemento no metálico de número atómico 52. Sólido blanco argentéreo, soluble en ácidos sulfúrico y nítrico e insoluble en agua. Tóxico.

Save record 3

Record 4 2010-06-10

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
FeSe
formula
CONT

The chemical formula of mineral achavalite is indicated by the formula FeSe. It... is usually found at its type of locality at Cerro de Cacheuta, Mendoza, Argentina. This mineral is named after L. Achaval. Mineral achavalite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes.

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
FeSe
formula
DEF

Minéral du système cristallin hexagonal [qui] se présente en masses opaques gris-noir à éclat métallique.

OBS

Découverte en 1939, dédiée à L. Achaval.

Spanish

Save record 4

Record 5 2005-02-03

English

Subject field(s)
  • Spacecraft
CONT

The US Navy’s Fleet Satellite Communications System (FLTSATCOM) is a constellation of five operational satellites used by both the Navy and Air Force as well as the presidential command network. The system with a design life of five years, serves as a secure communications link between the three users. Each satellite has 23 communications channels, 10 of which are used by the Navy for communication between its land forces, ships and aircraft. The Air Force uses 12 of the channels as part of its satellite communications system for command and control of nuclear forces. One channel is reserved for US national command authorities.

CONT

FLTSATCOM systems feature a main transmitting antenna that is 11 feet in diameter and surrounded by wire mesh screen. The body itself is hexagonal and is 8 inches wide and 4 feet tall. Two improved satellites recently joined four FLTSATCOM originals in orbit to extend the operation of the system well into the 1990s. The new systems carry an experimental extra-high-frequency package as a testbed for terminals being developed for the Milstar communications system.

French

Domaine(s)
  • Engins spatiaux
CONT

[...] un système de transmissions par satellite Fleetsatcom.

Spanish

Save record 5

Record 6 1990-09-28

English

Subject field(s)
  • Technical Textiles
  • Civil Engineering
  • Soil Mechanics (Engineering)
CONT

Soil confinement systems based on cellular geotextile nets... were first developed and evaluated by the Laboratory Régional des Ponts et Chaussées in France during 1980 and subsequently marketed under the tradename "Armater". These cellular nets are formed by welding strips of geotextile together at regular intervals so that when the strips are fully stretched open they form a honeycomb net about 200 mm deep with either hexagonal or diamond shaped apertures. The main application for the original Armater system is the control of rainfall erosion.

French

Domaine(s)
  • Textiles techniques
  • Génie civil
  • Mécanique des sols
OBS

Filet : Produit constitué d'un assemblage par points de nouage de fils, filaments, bandelettes, etc. et présentant une structure ouverte, les ouvertures ayant des dimensions très supérieures aux dimensions apparentes des constituants.

Spanish

Save record 6

Record 7 1980-03-14

English

Subject field(s)
  • Analytical Chemistry
OBS

Scanning loops in the isotherms for the hexagonal aluminate-calcium lignosulfonate solutions-H20 system, show complete irreversibility.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 7

Record 8 1978-08-10

English

Subject field(s)
  • Mineralogy
OBS

A light-blue, hydrated zinc sulfate, with zinc and aluminum hydrates(...) that crystallizes in the hexagonal system.

French

Domaine(s)
  • Minéralogie
OBS

Sulfate hydraté naturel d'aluminium et de zinc, en petites plaques hexagonales bleuâtres.

Spanish

Save record 8

Record 9 1977-08-04

English

Subject field(s)
  • Paleontology
OBS

[Foraminifers of the family Discocyclinidae have a] Test circular or stellate, thin or inflated, composed of equatorial layer with lateral chambers on each side; [the] megalospheric generation with [a] subspherical initial chamber partly or completely embraced by [a] larger second chamber; microspheric generation with initial coil of small chambers; equatorial chambers [are] rectangular to faintly hexagonal in plan; radial chamber walls, when present, [are] arranged in annuli; equatorial chambers [are] connected by annular and radial stolons with adjacent chambers in [the] same annulus and with adjacent chambers in [the] next inner and next outer annulus; intraseptal and intramural canal system present... "Paleoc.-Eoc. ".

French

Domaine(s)
  • Paléontologie
OBS

[Les Foraminifères de la famille des Discocyclinidae ont un] Test mince ou discoïde, circulaire ou en étoile; [un] embryon constitué par une protoconque subsphérique entourée partiellement à totalement par la deutéroconque; juvenarium B planispiralé; une couche de loges équatoriales disposées en cercles concentriques, arquées ou bien annulaires divisées en logettes rectangulaires ou légèrement hexagonales; loges reliées par des stolons radiaux et annulaires; logettes latérales petites et nombreuses. Il existe un système de canaux intraseptaux fins et simples, radiaux et annulaires, peut-être aussi entre des logettes latérales [...]

Spanish

Save record 9

Record 10 1977-08-04

English

Subject field(s)
  • Paleontology
OBS

[Foraminifers of the family Lepidocyclinidae have a] Test circular or radiate, compressed to inflated lenticular, composed of distinct equatorial layer overlain on each side by zones of lateral chambers or by laminated shell material with vacuoles; embryonic chambers bilocular, followed by distinct, long spiral of periembryonic chambers, or by short spiral of these chambers, or by reduced sequences of periembryonic chambers on periphery of embryonic chambers; equatorial chambers [are] arcuate, ogival, rhombic, spatulate or hexagonal; chamber walls perforate with definite stolons, without canal system(...) "M. Eoc-M. Mio".

French

Domaine(s)
  • Paléontologie
OBS

[Les Foraminifères de la famille des Lepidocyclinidae ont des] couches équatoriale et latérale: la forme A ne possède plus aucune trace d'enroulement spiralé, mais débute par un embryon biloculin (rarement plus).

Spanish

Save record 10

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