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Green earth (celadonite)

A soft, gray-green, iron silicate mineral. Celadonite was first described in 1847 on Mr. Baldo near Verona, Italy. It is a Mica type mineral that has been found as a Pigment in some Chinese and Indian paintings.

Synonyms and Related Terms

green earth; celadonita (Esp.); Seladonit (Deut.), Celadonit (Deut.); céladonite (Fr.); seladonitis (Gr.); celadonite (It., Port.); terra verde (It.); groene aarde (Ned.)

Physical and Chemical Properties

Composition K(Mg,Fe2+)(Fe3+,Al)[Si4O10](OH)2
Mohs Hardness 2
Density 2.5-2.7 g/ml
Refractive Index 1.62

Additional Images

Resources and Citations

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: density 2.5-2.7 and ref.index.1.62
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998