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Manganese oxide on limestone. The main dendrite is 6 cm across. From National Limestone quarry, Mount Pleasant Mills, Pennsylvania. (Author: Jessica Simonoff)

Manganese oxide on limestone. The main dendrite is 6 cm across. From National Limestone quarry, Mount Pleasant Mills, Pennsylvania. (Author: Jessica Simonoff)

Dimensions: 400 x 376
File size: 43.03 kbytes
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