1947-177 residue 3 gypsum particle XPL 400x.jpg

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Well-formed gypsum particle, XPL, 400X. Sample collected from brownish residues in an apothecary jar in the Colonial Williamsburg Collection (CWF 1947-177). Note the 'swallowtail' shape and low birefringence showing first order gray colors. Extinction was inclined. Examined with a Nikon NiU upright polarizing light microscope, image captured with DSRi1 Pixel-shifting camera and Nikon Elements Basic Research software. Colonial Williamsburg Foundation, Materials Analysis Laboratory.

Photo credit: Kirsten Moffitt, Colonial Williamsburg Foundation

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