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The selection of the Chickasaw types/varieties follows Brain's Tunica work and references it, but note the differences.
The Chickasaw glass bead database, if divided into varieties strictly invoking Brain's typology, would include several hundred varieties, perhaps in excess of 300.
The combining of these types joins the simply constructed bead with those compound beads that have an identical matrix but the matrix is coated with a thin layer of clear glass.
Brain noted a thin clear glass coating on many Tunica bead varieties, for instance IVA1 and IVA7.
Most of the Chickasaw thin, clear glass coating was observed on the IA/IIIA Opaque, specifically the white colors.
Brain sized his IIA1 examples as very small to very large.
Brain elected not to use size to define any bead variety; rather he reported a size range for each variety.
Wire-wound beads were produced by melting a solid rod of glass around a spinning mandrel.
The tube beads were divided into four classes (I-IV) based on whether or not the bead shape is rounded and whether its construction is simple, compound, complex or composite.