SD155 Stromatolitic Dolomite rough rock, cut and polished on one side.
Sections consist of a chaotic mixture of dolomite and/or stromatolite fragments set in a matrix of mudstone and/or coarsely crystalline dolomite .
The pink and red colouration can be attributed to the presence of finely disseminated iron oxides . It often contain layers and nodules of red chert.
From the Irregully Formation, Western Australia.
Dimensions approximately 165mm x 40mm x 5-45mm thick
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