mineraloftheday-blog: Mineral Of The Day #134: Nontronite Mohs…

mineraloftheday-blog:

Mineral Of The Day #134: Nontronite

Mohs Hardness Scale: 1.5-2
Category: phyllosilicate mineral, smectite group
Formula: (CaO0.5,Na)0.3Fe3+2(Si,Al)4O10(OH)2·nH2O

Fun Facts:

  • Nontronite is the iron-rich member of the smectite group of clay minerals.
  • It forms from the weathering of biotite and basalts, precipitation of iron and silicon-rich hydrothermal fluids, and in deep-sea hydrothermal vents.
  • Nontronite is named after its type locality of Saint-Pardoux, Nontron (Dordogne, France).

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