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Smithsonian National Museum of Natural History

Grossular Garnet

Photograph of a group of half-carat grossular garnets (NMNH G7918) from the National Gem Collection displaying a range of colors
Photo by Chip Clark. Click to zoom.
Catalog Number NMNH G7918-00
Locality Kenya/Tanzania
Weight 16.8 ct

Gift of Mr. and Mrs. Hans-Dieter Haag in 1978.

Grossular is the garnet mineral that shows the widest range of colors. As pure calcium aluminum silicate it is colorless, but impurities can tint it shades of pink, orange (hessonite), yellow, brown and green (tsavorite). This group of 39 grossular garnets, averaging about 0.50 carat each, range in color from light orange to colorless to medium dark green. These gems were found in Kenya along the border with Tanzania.



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