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what could these blue rocks be

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vince8388
 
Reply Thu 9 Oct, 2014 01:34 pm
http://i.imgur.com/EOONBnv.jpg
they are very dark blue and seem to make up a hematite concrete found this i a 2 foot wide stream like looking path that ended at the cliffs edge
the piece n the image is the size of a penny
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Type: Question • Score: 4 • Views: 670 • Replies: 1
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farmerman
 
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Reply Thu 9 Oct, 2014 02:03 pm
@vince8388,
looks mostly like a form of chert, which is a softer silica (like quartz). It seems to lie among the ooids and, as such, is quite common.

Its a sign of a fairly high concentration solution in an agitated shallow sea- water medium.
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