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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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:12, 27 September 2017		1,014 × 811 (618 KB)	KMoffitt (talk \| contribs)	File uploaded with MsUpload

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Gypsum

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Width	1,014 px
Height	811 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS2 Windows
File change date and time	15:10, 27 September 2017
Color space	Uncalibrated
Image width	1,014 px
Image height	811 px
Date and time of digitizing	11:10, 27 September 2017
Date metadata was last modified	11:10, 27 September 2017

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

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