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I think it might be aventurine of some sort, but I'm not sure.

translucent blue-green oblong crystal

  • Hardness: It is harder than a steel nail file. The file leaves a track, but it rubs off, leaving no mark. I scraped it on the bottom unglazed portion of a mug. It left no marks on the mug and white power on the stone that mostly rubbed off.
  • Lustre: It has a waxy or greasy lustre.
  • It has bluish 'veins' below the surface, one dark green spot, and one light blue spot.

What other tests can I make?

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  • $\begingroup$ Pretty. It is most likely chalcedony, a form of quartz. It should be harder than steel so you can't scratch it with a knife. $\endgroup$ – haresfur Dec 26 '18 at 21:48
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    $\begingroup$ When you found it, was it polished smooth as it is? Where did you find it? Were there other similar pebbles around? $\endgroup$ – haresfur Dec 26 '18 at 23:02
  • $\begingroup$ It was given to me. The person who gave it does not know. It is polished. $\endgroup$ – Chloe Dec 27 '18 at 0:09
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This is chalcedony or agate, which are cryptocrystaline quartz. If the dark spot is greenish you could call it moss agate. I base this answer on the translucence, hardness, lack of streak, and ability to take a polish.

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