The Rock-Color Chart (issued by the Geological Society of America) is a system of 115 rectangular color chips (size: 1/2 × 5/8 in) arranged in an orderly scale of equal visual steps mutually relating the three attributes comprising color (hue, chroma, and value) of common rocks. The symbols for hue (red, yellow, green, blue, and purple), value (lightness of color), and chroma (relative strength or departure from a neutral color of the same lightness) are individually related quantitatively as shown in Fig. 1.
Hue, value, and chroma in relation to one another. The circular band represents the hues in their proper sequence, where R stands for red, YR for yellow red, G for green, B for Blue, P for purple, etc. The paths pointing outward from the center show the steps of chroma, increasing in strength as indicated by the numerals. (Munsell Color Company)
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References
Geological Society of America, 1964, Rock-Color Chart, 2nd ed. New York.
Judd, D. B., 1963, Color in Business, Science, and Industry. New York: John Wiley & Sons, 500p.
Cross-references
Soil Sampling; Soils and Weathered Materials, Field Methods and Survey. Vol. XIII: Engineering Geology Reports.
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© 1988 Van Nostrand Reinhold Company Inc.
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Chico, R.J. (1988). Rock-color chart . In: General Geology. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30844-X_95
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