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258-Kaolin, Feldspar alteration, erosion, and distribution in ocean sediments Gr 9-12 $6.00

Mystery includes rock, fossil, or mineral sample and Mystery questions with teaching instructions.

MYSTERY SAMPLE:
--Powdered Kaolin Clay
Note: Kaolinite is the name associated with the pure crystalline form of the mineral. Kaolin is the name for the industrial clay, which is mostly composed of kaolinite, but also has other minerals in it.


TEACHING OBJECTIVES:
--To introduce the mineral kaolinite and the notion of a secondary mineral formed by the process of mineral alteration
--To illustrate the difference between residual and sedimentary kaolin deposits
--To introduce the idea that during erosion and transport mineral mixtures can be separated into individual minerals that collect in pure deposits. The purity of a mineral deposit will effect its economic value.
--To introduce the idea that climate effects the kind of clay minerals in soils; kaolinite is common in tropical soils, while chlorite is more abundant in soils from temperate climates.
--To introduce the notion that the kind of clay in ocean sediments varies in different parts of the ocean depending upon whether the source of the clay is tropical or temperate, and whether the transport energy is wind, or water.
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Ruth Deike
Rock Detective Geoscience Education
395 Deer Run Drive
Nellysford , VA 96080

Phone: 434-263-3737

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