Green earth

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Celadonite

Description

Green colored siliceous, iron-rich clays that have been used as pigments since ancient times. Green earth pigments were ground from available minerals, principally celadonite and glauconite, though cronstedtite, montmorillonite, and chlorite have also been used. The color of green earth can range from yellow-green to sea-green to greenish-gray. In general, green earth is translucent in oils with moderate tinting strength and poor hiding power. It is a permanent, stable pigment that is compatible with all media. Green earth, or terre verte, is sometimes imitated by mixtures of Naples yellow and Prussian blue.

Chlorite

Synonyms and Related Terms

Pigment Green 23; CI 77009; terre verte (Fr.); terra verde (It., Port.); tierra verde (Esp.); grüne Erde (Deut.); creta viridis; celadon green; Veronese earth; Belgian earth; Hessian earth; Tyrolean earth; Bohemian earth; Saxon earth; Rhenish earth; green stone; Theodotion; prasina; holly green; verdetta; aegirin; celadonite: glauconite: cronstedtite; chlorite

Raman

CeladoniteRS.jpg

Raman

ChloriteClinochloreitaly1.jpg

FTIR

MFA- Green Earth, Terre Verte.jpg

XRD

PIG360.jpg


Other Properties

Slightly soluble in acids. Turns a warm, dark-brown color (known as burnt green earth) when heated to around 500 °C.

Density 2.5-2.7
Refractive Index 1.62

Hazards and Safety

No significant hazards. Some forms of celadonite have fibrous needle-like crystals.

Additional Information

° C. Grissom, "Green Earth", Artists Pigments, Volume 1, R. Feller (ed.); Cambridge University Press: Cambridge, 1986.

° Pigments Through the Ages: Green earth Record content reviewed by EU-Artech, November 2007.

Additional Images


Sources Checked for Data in Record

  • 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
  • Artists' Pigments: A Handbook of their History and Characteristics, R.L.Feller, ed., Cambridge University Press, London, Vol. 1, 1986 Comment: C. Grissom "Green Earth"
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • External source or communication Comment: Contributed information: Helen Howard, November 2007
  • The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: "Pigment"
  • M. Doerner, The Materials of the Artist, Harcourt, Brace & Co., 1934
  • R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
  • Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980 Comment: ref. index = 2.5-2.7 (seems like an error)