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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Photomicrograph: Botryoidal Silica And Dolomite Cement In Proterozoic Sandstone

This week, a gorgeous example of botryoidal and banded silica cement filling pore spaces in Proterozoic sandstones from Central India. The sandstone has a complex history of cementation. Pore spaces are filled with dolomite or siderite, chalcedony and calcite. Isolated dolomite rhombs (image above) were the first mineral to precipitate around quartz grains, growing inwards into pore

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