Silcrete is an indurated soil duricrust formed when surface sand and gravel are cemented by dissolved silica. The formation of silcrete is similar to that of calcrete, formed by calcium carbonate and ferricrete, formed by iron oxide. It is a hard and resistant material, and though different in origin and nature, appears similar to quartzite. It is...
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http://en.wikipedia.org/wiki/Silcrete
silica-rich duricrust, an indurated, or hardened, layer in or on a soil. It generally occurs in a hot, arid climate where infrequent waterlogging ... [2 related articles]
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http://www.britannica.com/eb/a-z/s/94
a hardened rock formed when silica is dissolved from the soil and resolidifies as a cement. Heating silcrete in a fire makes the rock more suitable for making stone tools by pressure flaking.
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http://www.scientificpsychic.com/etc/geology-glossary.html
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