Celadonite

Celadonite

Description

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

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  XRD pattern of green earth

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  Raman (MFA)

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  FTIR (MFA)

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  XRF

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  SEM

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  EDS

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)

• Wikipedia: http://en.wikipedia.org/wiki/Celadonite (Accessed Sept. 2, 2005)mohs=2, spec. grav=3)

• The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998