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NesosilicatosMinerals petrocheneticos


mineralformula quimicaMgFeSiOforsteritaMgSiOfayalitaFeSiOnesosilicatosrocas igniasmetamorficasquarzperidotitasbasaltosgabrosmárbolsdolomíaschema












Olivín




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Olivín

enclau de cristals d'olivín en una roca volcanica

Caracteristicas chenerals
Categoría:
Nesosilicatos

Clase:
9.AC.05

Formula quimica:
(Mg,Fe)2SiO4

Propiedatz fisicas

Color:
Verde olivacia, verde amarillenca, negra verdenca, parda royenca

Raya:
Blanca

Lustre:
Vitrio

Transparencia:
Transparent a translucido

Sistema cristalín:
Ortorrombico

Habito:
Masivo a granular

Dureza:
6,5 - 7

Densidat:
3,5

L'Olivín ye un mineral con formula quimica (Mg,Fe)2SiO4 (en realidad bi ha dos estremos: a forsterita Mg2SiO4 y a fayalita Fe2SiO4), d'o grupo d'os nesosilicatos.


L'olivín se troba en rocas ignias y metamorficas. En as rocas ignias ye incompatible con o quarz y ye un d'os components principals d'as rocas ignias basicas y ultrabasicas como as peridotitas, bells basaltos, gabros. En as rocas metamorficas se troba en os márbols que s'han formato a partir de dolomías con quarz.


As formas d'olivín que se pueden fer servir como chema se dicen peridot u peridota.



Bibliografía |



  • Medenbach, Olaf y Sussieck-Fornefeld, Cornelia, Minerales. Guías de la naturaleza Blume, 1990.


Vinclos externos |



  • Colabora en Commons Se veigan as imáchens de Commons sobre Olivín.



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