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Natural or man made?

slowburner · 2011-10-04 18:35:50

This is a section through a sample of what looked to me like concrete from the bed of a small stream. In the picture it is wet - hence the black colour, when dry it is grey but the aggregate is difficult to see clearly. From what I can gather, the aggregates in a naturally occurring conglomerate tend to be at different…

04-10-2011 6:35pm

#1

slowburner

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This is a section through a sample of what looked to me like concrete from the bed of a small stream. In the picture it is wet - hence the black colour, when dry it is grey but the aggregate is difficult to see clearly.
From what I can gather, the aggregates in a naturally occurring conglomerate tend to be at different angles to each other and angular in their structure. In this sample, the stones are rounded and pretty much aligned in the same direction. It is softer than concrete though - could it be a 'lime-crete'?
Any thoughts very welcome indeed.

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#2 07-11-2011 7:58pm

slowburner

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If anyone's interested, the sample is natural, according to a geologist - natural stream pebbles bound together with iron oxide from a stream with an incredibly high mineral content.

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