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259-Biotite in Thin Sheets Grades 5-12 $7.00
Biotite is made of very thin layers that slide over each other like a slippery deck of cards.  The thin layers are formed by the arrangement of the atoms inside the mineral.  We can’t see atoms with just our eyes, but all minerals are made of them.
The atoms that form the sheets hold on tightly to each other, but between the sheets the bonds between atoms are much weaker.

MYSTERY SAMPLE:
    — A speciman of biotite that shows deep brown color and cleavage sheets

TEACHING OBJECTIVES:
    — To introduce the mineral biotite
    — To introduce the arrangement of atoms inside biotite and the notion that atoms are bonded
         together by negative and positive electrical charges.

GRADES 5-12
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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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