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venerdì 22 febbraio 2013

Rubrica delle pietre: Granato vr Grossularia



Ciao Ragazze,
anche questa settimana sia arrivati venerdì  quindi sta arrivando forse uno dei week end più importanti per la storia italiana, riusciremo a cambiare e voltare pagina...ma essendo venerdì qui si parla di gemme, oggi vi presento uno dei graniti ldella serie  ugrandite: Granato vr grossularia



UGRANDITE

Granati calcici, A2+= Ca2+ è sempre occupato dal Ca
La sostituzione sarà sugli elementi trivalenti:

1.      Ugrandite  Ca3Cr2(SiO4)3
2.      Grossularia Ca3Al2(SiO4)3
3.      Andradite Ca3Fe2(SiO4)3
Miscibilità  completa con i tre termini l’uvarovite non ha interesse gemmologico.
Grossularia e andradite e la loro miscela Ca3(Al,Fe)2(SiO4)3

Caratteristiche generali

Gruppo monometrico, sistema cubico, la maggior parte dei granati ha un comportamento di BRA a chiazze   a volte anche a graticcio ma bisogna stare attenti con gli spinelli, questo atteggiamento di BRA dipende dal fatto che sia pieno di inclusioni, e che sia anche a volte molto distorto il reticolo a causa delle vicarianze.
Gli spinelli hanno un indice più basso dei granati quindi bisogna stare attenti all’indice per distinguerli.
Lucentezza = vitrea 

Sfaldatura = assente

Frattura = concoide

Dispersione =  variabile (0,007-0,057)

Durezza = 7-7,5 con eccezione dell’andradite 6,5-7

 Effetti ottici =

1.      asterismo poco marcato a 4-6 punte (almandino)
2.      metamerismo raro (piropo spessartina)
3.      gatteggiamento andradite verde

Fluorescenza = assente

Genesi =

1.      rocce magmatiche intrusive di origine profonda kimberliti peridotiti e pegmatiti (filoniane)
2.      rocce metamorfiche regionali e di contatto  micascisti eclogiti.

Grossularia  

Gamma di colori molto estesa

Colori = incolore giallo rosa verdi arancione (rosso raro)

Minerali allocromatico (Fe3+Cr3+, V3+, Mn2+Mn3+) le numerose vicarianze, che portano  a una certa varietà di colori in natura.
Questa pietra è una delle pietre che fa parte della serie della ugrandite ( uvatorite, Grossularia, Essonite, Tsavorite idrogrossularia)



Segno Zodicali 


  1. Leone
  2. Capricorno

Cristalloterapia
  1. Ricordano l'interconnessione della vita con la Terra tramite le linee della Kundaline, riattivano il primo Chakra
  2. Trasmettono energia d'anore
  3. Agisce sulla tachicardia
  4. Da fiducia a se stessi
  5. Propizia la pace
Ora vi saluto vi mando un abbraccio baci buon week end Alex

53 commenti:

  1. heheh Alex mi servirebbe anche questa per avere più fiducia in me.. davvero!!! amo questa rubrichina!! un bacino :* buon WE

    RispondiElimina
    Risposte
    1. Ciao Pam,
      sono contenta che questa rubrica ti piaccia. Baci buona giornata Alex

      Elimina
  2. Buondì Alex, purtroppo non potro' dare il mio contributo per cambiare la nostra situazione...sono un po' arrabbiata col meteo, anche stamani ci siamo svegliati con la neve.Buon week end cara!

    RispondiElimina
    Risposte
    1. Ciao Ale,
      anche qui ha ripreso a nevicare, meno male che ho il seggio vicino a casa a meno di 1 km...quindi domani posso dare il mio contributo spero che sia sufficiente. Baci buona giornata Alex buon week end

      Elimina
  3. Ciao Alex! Questa pietra ha scritto sopra il mio nome bellissima:)
    Un bacione!

    RispondiElimina
    Risposte
    1. Ciao Ale,
      si è una bellissima pietra. Baci buona giornata Alex

      Elimina
  4. Ciao Alex! Ho i miei dubbi che questo weekend possa cambiare le cose, ma pensiamo positivo, vah!

    RispondiElimina
    Risposte
    1. Ciao Sara
      spero che cambi qualcosa perchè se qui diventiamo peggio della Grecia. Baci buona giornata Alex

      Elimina
  5. molto interessante!!!e aspettiamo tutti i risultati delle votazioni, ma anche io sono un pò sfiduciata!
    paolasophia.blogspot.it

    RispondiElimina
    Risposte
    1. Ciao Paola,
      speriamo che questa volta qualcosa cambi e non sia sempre il tutto cambia per non cambiare il solito motto gattopardesco. Baci buona giornata Alex

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