Figure 10. Field occurrences and hand specimens of Microfacies 2 sinter. (1) Overview of Microfacies 2 with sinters (white deposits) surrounded by relatively quiescent thermal water. A green microbial mat (algal) covers portions that are 52.5°C. Photo width is ~5 m. (2) Cup-shaped siliceous sinter (white rim and green/white spicules) depositing on the upper surface of a pumice clast. Bar represents 4 cm. (3) Spiculose deposit covering entire substrate surface. Bar represents 1.5 cm. (4) Cup-shaped and spiculose deposits forming in areas where thermal water flow is confined to small spaces between densely clustered substrates. Coin at the lower right is 2 cm wide. Bar represents 2.5 cm. (5) Side-on view of sinter showing a rim along inner portions of the deposit, while the outer portions are covered by vertical spicules. (6) Vertical section through sinter showing a white deposit with fine laminae. Sinter rests on a silicified sandy substratum (brown). Bar represents 1 cm.