sap·ro·lite

[sap-ruh-lahyt]
noun Petrography.
soft, disintegrated, usually more or less decomposed rock remaining in its original place.

Origin:
1890–95; sapro- + -lite

sap·ro·lit·ic [sap-ruh-lit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
saprolite (ˈsæprəʊlɪt) [Click for IPA pronunciation guide]
 
n
a deposit of earth, clay, silt, etc, formed by decomposition of rocks that has remained in its original site
 
sapro'litic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Saprolite is always a great word to know.
So is callithumpian. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
American Heritage
Science Dictionary
saprolite   (sāp'rə-līt')  Pronunciation Key 
Soft, thoroughly decomposed and porous rock, often rich in clay, formed by the in-place chemical weathering of igneous, metamorphic, or sedimentary rocks. Saprolite is especially common in humid and tropical climates. It is usually reddish brown or grayish white and contains those structures (such as cross-stratification) that were present in the original rock from which it formed.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Weathers to reddish-brown or gray saprolite in uplands.
Quartz abundances and grain sizes are relatively constant with depth in a thick
  saprolite.
Physically weathered saprolite adds material to the bottom of the profile.
The bedrock aquifer is semi-confined, with the unfractured bedrock and
  saprolite acting as confining units.
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