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help id this blue stone found on the beach in Spain

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I found a dark blue stone on the beach and thought it was beach glass but I don't think so. Its soft, maybe a 3 on the Mohs scale. Top photo is take dry and bottom is take when the stone is wet.

asked Apr 16, 2015 by seekagape (160 points)
edited Apr 17, 2015 by seekagape

2 Answers

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Can you take a few more photos, and possibly a close-up? Is it transparent? Are there any fracture markings?
answered Apr 16, 2015 by hershel (52,800 points)
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I'm starting to think it is sea glass. Its has little bubbles inside and is fairly translucent. When held up to a light bulb you can see a bit of marbling of the blue inside. No fractures are present. I will try for a photo with the back light.

answered Apr 17, 2015 by seekagape (160 points)