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Gabbro

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13282000GabbroGabbro is named after a village in Tuscany (Italy). The colour of this volcanic rock varies from bluish grey to dark grey, sometimes almost black, with greenish shades.GabbroGabbro is named after a village in Tuscany (Italy). The colour of this volcanic rock varies from...Zoom http://www.museum-lehavre.fr/sites/default/files/styles/exposition/public/multimedia/dsc_6839_0.jpg?itok=mS3JJfDVLe Havre Museum of Natural History - Photo C. Livonnen

Gabbro

 

  • Donor / collector : Serge Henry
  • Rock type : plutonic rock
  • Age : unknown
  • Origin : unknown
  • Dimensions : 9 cm x 5 cm

Gabbro is named after a village in Tuscany (Italy). The colour of this volcanic rock varies from bluish grey to dark grey, sometimes almost black, with greenish shades because of chlorite.

It is composed of dark plagioclases : labradorite, bytownite, and over 50% of anorthite. It also contains pyroxene, hornblede, olivine, biotite, ilmenite and pyrrhotine. Gabbro is generally coarse-grained.

Gabbro can be used in stone buildings and for track ballast. Polished gabbro is commonly used in funerary art and for wall claddings.

Origin : Odenwald, Hartz (Germany), Valais (Switzerland), Transvaal (South Africa), Montana, and Minnesota (USA)

 


Chloritization : A volcanic rock alteration process during which potassium included in mica is substituted by aluminium when exposed to air, resulting in chlorite. 

Ballast : The crushed stone trackbed upon which railroad ties are laid.

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