Mordenite

Mordenite
Classificazione StrunzVIII/J.22-30
Formula chimica(Ca,Na2,K2)Al2Si10O24·7(H2O)
Proprietà cristallografiche
Sistema cristallinoortorombico[1]
Parametri di cellaa=18,114, b=20,514, c=7,527, Z=4, V=2796,96[2]
Gruppo puntualemm2
Gruppo spazialeC mc21
Proprietà fisiche
Densità2,15[1], 2,08 (calcolata)[2] g/cm³
Durezza (Mohs)4-5[1]
Sfaldaturafacile[1]
Fratturairregolare[1]
Coloreincolore, bianco, allocromatico[1]
Lucentezzada vitrea a sericea[1]
Opacitàda trasparente a traslucida[2],
Strisciobianco[1]
Diffusionerara
Si invita a seguire lo schema di Modello di voce – Minerale

La mordenite è un minerale, un silicato (tettosilicato) che appartiene al gruppo delle zeoliti.

Storia ed etimologia

Il minerale fu scoperto, nella seconda metà del XIX secolo, tra le rocce basaltiche di una spiaggia presso Morden, da cui prende il nome, in Nuova Scozia (Canada).[1]

Abito cristallino

Si presenta in druse di cristalli aciculari, ciuffetti di cristalli, aggregati fibroso-raggiati, spesso è associata con altre zeoliti. La natrolite è molto simile alla mordenite; esse sono indistinguibili, utilizzando metodi semplici.[3]

Origine e giacitura

Questo minerale si può trovare specialmente nelle cavità delle rocce vulcaniche molto ricche di silice ad esempio le rioliti e le andesiti in cui è associata ad epistilbite, ferrierite, analcime, heulandite, quarzo ed opale.[1]

Forma in cui si presenta in natura

Druse di cristalli prismatici molto sottili striati o in masse di cristalli aghiformi o in masse cotonose o in masse compatte simil-porcellana.[1]

Località di ritrovamento

Usi

Minerale d’interesse scientifico e collezionistico.

Note

  1. ^ a b c d e f g h i j k l m Autori Vari, scheda Mordenite in "Il magico mondo dei minerali & gemme", De Agostini, 1993-1996 Novara
  2. ^ a b c Dati webmin
  3. ^ ”R. Hochleitner, Guida ai Minerali, Ricca editore, Roma, 2017
  4. ^ Carlo Maria Gramaccioli, Mordenite in "I minerali dalla A alla Z", Peruzzo, (1988) Milano
  5. ^ ” K. Saemundsson, E. Gunnlaugsson, Icelandic Rocks and Minerals, Mál og Menning, 2010”

Altri progetti

Collegamenti esterni

  • (EN) Webmin, su webmineral.com.


  Portale Mineralogia: accedi alle voci di Wikipedia che trattano di mineralogia

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