Bronzite
- Bronzite
-
Enstatite[1]
Catégorie IX : silicates[2]
|
bronzite de tanzanie
|
Général
|
Classe de Strunz |
9.DA.05 |
Formule brute |
(MgFe2+)2Si2O6 |
Identification
|
Masse formulaire |
200,78 uma |
Couleur |
brun |
Classe cristalline et groupe d'espace |
dipyramidale ; P bca |
Système cristallin |
orthorhombique |
Réseau de Bravais |
primitif P |
Macle |
macle lamellaire sur {100} |
Clivage |
distinct sur {110} et {010} |
Cassure |
irrégulière |
Habitus |
prismatique, lamellaire |
Échelle de Mohs |
5 - 6 |
Trait |
gris à blanc |
Éclat |
vitreux, nacré |
Propriétés optiques
|
Indice de réfraction |
α=1,650-1,668 β=1,652-1,673 γ=1,659-1,679 |
Pléochroïsme |
fort |
Biréfringence |
Δ=0,009-0,011 ; biaxe positif |
Propriétés chimiques
|
Densité |
3,2 - 3,3 |
Propriétés physiques
|
Radioactivité |
aucune |
Unités du SI & CNTP, sauf indication contraire.
|
La bronzite est une variété férifère d'enstatite, de couleur bronze de formule (MgFe2+)2Si2O6.
Synonymie
Utilité
- Utilisé comme pierre ornementale.
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Notes et références
Wikimedia Foundation.
2010.
Contenu soumis à la licence CC-BY-SA. Source : Article Bronzite de Wikipédia en français (auteurs)
Regardez d'autres dictionnaires:
Bronzite — is a member of the orthopyroxene group of minerals, belonging with enstatite and hypersthene to the orthorhombic series of the group. Rather than a distinct species, it is really a ferriferous variety of enstatite, which owing to partial… … Wikipedia
Bronzite — Bronz ite, n. [Cf. F. bronzite.] (Min.) A variety of enstatite, often having a bronzelike luster. It is a silicate of magnesia and iron, of the pyroxene family. [1913 Webster] … The Collaborative International Dictionary of English
bronzite — ● bronzite nom féminin Pyroxène orthorhombique riche en magnésium … Encyclopédie Universelle
bronzite — bronzitas statusas T sritis chemija apibrėžtis Mineralas. formulė (Mg,Fe)₂[Si₂O₆] atitikmenys: angl. bronzite rus. бронзит … Chemijos terminų aiškinamasis žodynas
bronzite — /bron zuyt/, n. a greenish brown or black mineral with a bronzelike luster, an orthorhombic pyroxene, (Mg,Fe)2(Si2O6), intermediate in composition between enstatite and hypersthene. [1810 20; BRONZE + ITE1; so called from its sheen] * * * … Universalium
bronzite — bronz·ite … English syllables
bronzite — ˈbränˌzīt noun ( s) Etymology: German bronzit, from bronze (from French) + it ite more at bronze : a mineral consisting of a ferriferous variety of enstatite often having a luster like that of bronze … Useful english dictionary
Enstatite — Infobox mineral name = Enstatite category = Silicate mineral boxwidth = boxbgcolor = imagesize = caption = formula = Mg2Si2O6 molweight = color = White, grey, green, yellow or brown colorless in thin section. habit = Lamellar, fibrous, or massive … Wikipedia
H chondrite — The H type ordinary chondrites are the most common type of meteorite, accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of the chondrites1. The name comes from their (H)igh iron abundance, with… … Wikipedia
Hypersthene — is a common rock forming inosilicate mineral belonging to the group of orthorhombic pyroxenes. Many references have formally abandoned this term, preferring to categorise this mineral as enstatite or ferrosilite. It is found in igneous and some… … Wikipedia