TrekGEO > Mineral Trail > Kanto region > Saitama pref. > Talc

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Nogami-Shimogo, Nagatoro city, Chichibu county, Saitama pref., Japan


Field of view: 30 mm. Talc associated with dolomite. The columnar group of white fibers at the left is talc. The grayish-white part exhibiting perfect cleavage at the right is dolomite.

Recovered from serpentinite in an accretionary complex subjected to Greenschist facies high-pressure metamorphic rock.

Combination of dolomite and talc is explained by the CO2 fluid in fissures of serpentinite:

2Mg3Si2O5(OH)4 (Serpentine) + 3CO2 = Mg3Si4O10(OH)2 (Talc) + 3MgCO3 (Magnesite component in Dolomite) + 3H2O

Talc from this location was described in 1913.

Other localities

  • Miyazawa (Serpentinite, Fibrous)
  • Kurotani Valley (Serpentinite, Massive)
  • Ninomiya (Serpentinite, Massive)
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