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Found on a Long Island Sound beach -- what are they?

+1 vote

Hi! Can anyone tell me what these two are? I thought they might be rutilated quartz, but they have white string-like incursions, not the gold ones that pictures of rutilated quartz seems to have. Any suggestions welcome.
Thanks in advance,

asked Nov 8, 2018 by wddt (130 points)

3 Answers

0 votes
They are very well polished. If this is quartz you will not be able to scratch it with a common nail or pocket watch. I will do further research..
answered Nov 11, 2018 by Weasel (58,980 points)
0 votes
To me, they look like agates or chalcedony. Very interesting find!
answered Nov 13, 2018 by linkisnotzelda (5,390 points)
0 votes
From appearance alone, looks like waterworn quartz with natural fracturing in the crystals causing the white lines. Nice pieces from a Long Island beach!
answered Jun 6, 2019 by hershel (52,820 points)
Thank you, Hershel, I had a feeling it might be something like that. In the interim, I have found several more pieces that are very similar. I'm not sure what could be causing that fracturing pattern on a calm beach (unless it was the original action of the ice that created the moraine that is Long Island?)
Crystal often have fracture clouding as part of natural development process. The fractures may also have occurred during the glacial activity, melting, or waterworn activity that caused it to become round. Either way, very nice pieces!