|Figure A-1. Travertine from Tivoli, east of Rome, Italy. Microcrystalline clusters occur alone (circle) and in strands (arrows) that are commonly attributed to bacterial precipitation. Clear calcite (C) fills much original pore space between clusters, but some pore spaces (P) remain.
Another image in this atlas shows another and somewhat different travertine.
Photomicrograph was taken in plane-polarized light; field of view is 1.9 mm wide. Tivoli, Lazio, Italy; thin section MR67; sample collected by L. Bruce Railsback.
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