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CHERT #2 (detail) Go on to: #1 | #2 | #3 | #4 Chert 
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Composition
Silica |
Description
In this close-up we see better the conchoidal fracture of the specimen.At first it would be very easy to confuse this specimen with some micrites. This chert and micrite #2 look superficially almost identical. Two test separate them clearly, however. First, hardness; micrite is softer than a knife blade, while the blade just slips across this surface. Second, micrite reacts with acid, chert does not. |
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