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The samples analysed came from the bottom of a small loch. No. 1 was of a yellow-gray eolour, even in texture, and readily broken down between the fingers. No. 2 was distinctly red, and marked with dark spots. It broke down readily, and was more dense than No. 1. No. 3 sample was red in colour, with dark brown and red particles throughout the mass.doi:10.1180/minmag.1889.008.38.05 fatcat:kp4ahhd7qffylpf4xae6jx3gci