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What was the distinctive skill for which Cossacks were well-known?
Cleavage Planes
Natural planes of weakness along which minerals preferentially break, reflecting their crystallographic structure.
Asbestos
A general name for the fibrous varieties of a number of silicate minerals whose common characteristic is that they tend to form fibers.
Silicate Structure
The arrangement of silicon and oxygen atoms that forms the backbone of most minerals in the Earth's crust.
Silicon Tetrahedron
The fundamental building block of silicate minerals, consisting of a silicon atom surrounded by four oxygen atoms in a tetrahedral shape.
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