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i don't know what this is

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i am an novice at mineral and stone collecting, and i am having a hard time at identifying what these even are, i found these on a railroad covered mostly with volcanic stones which where grinded to a smaller size. they appear to be some sort of glassy material with marks from oxygen bubbles left. i tried to scratch glass with a smaller fragment and it did leave a mark, although not to deep.

1st picture of the first stone:front2nd picture of the first stone: backside1st picture of the second stone: top view

if you could help me identify what this is i would be very grateful!

thanks for reading!

asked Nov 10, 2015 by Tengo Kilitauri (120 points)

1 Answer

0 votes
Could you please edit this post and add a little information about where you found it. Something like not far from a volcano in Yosemite national park. Or a beach in Tokyo, Japan. I will edit this post later to give you my best guesses.
answered Nov 10, 2015 by Weasel (58,070 points)