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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

From: The quantification of physico-mechanical properties and durability of onyx-travertines from Santa Ana de los Ríos de Cuenca, Ecuador

Fig. 5

Optical micrographs for petrographic analysis. In this figure, Cn stands for calcified canes, Dd stands for dendritic crystals, Cy stands for crystals, cl stands for clasts and FeO stands for Iron Oxide. a Columnar calcite crystals and calcified canes fragments in YT. b Dendritic crystals in YT. c Hexagonal crystals perpendicular to the laminated facies in YT. d Rhombic crystals with high roundness in PT. e Lamellar layers of iron oxides alternated with layers of iron oxyhydroxides in PT. f Dendrites of rhombic crystals in PT. g Crystals of different sizes between layers in GT, h Cements with iron oxides (red-brown color) covering calcite crystals in GT. i Elongated calcite crystals alternating with layers of small crystals on a micritic matrix in GT. j Undissolved angular clasts during stone formation in micritic matrix in WT. k Fragments of calcified reeds in YT. l Hexagonal crystals with low roundness in YT

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