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

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Well-shaped particle of gypsum mixed with iron oxides. PPL, 400x. Sample collected from brownish resides in an apothecary jar in the Colonial Williamsburg Collection (CWF 1947-177). Particle has a columnar shape with characteristic 'swallowtail', or twinning, visible. 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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