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It looks like quartz, but it has blue veins on the surface that look died. Not all surface scratches are blue though.

small blue streak clear crystal

  • Hardness: > 6.5. Nail file will not scratch it. > 7 quartz will not scratch it. > 7.5 Herkimer diamond doesn't appear to scratch it. < 9 Ruby does leave a mark.
  • Lustre: It has an ever so slight aventurescence glitter sparkle in the surface within 1-2 mm of the surface. Hardly noticeable.
  • Has blue streaks in the cracks and crevices, but not all cracks.
  • It is polished or tumbled.
  • Unknown location.
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    $\begingroup$ It’s quartz. The veins could be anything and impossible to know with further study. $\endgroup$ – Gimelist Dec 28 '18 at 4:43
  • $\begingroup$ OK then I'll assume it's quartz. I won't ask about a similar one. Strange that one is blue-ish and one is purple-ish, while other quartz are clear. $\endgroup$ – Chloe Dec 31 '18 at 21:38
  • $\begingroup$ Quartz comes in many many colours. See this link for examples. $\endgroup$ – Gimelist Dec 31 '18 at 22:59
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Assuming quartz cannot scratch it, I have my beliefs it could be topaz.

Topaz is extremely similar to quartz, except it's harder and thus cannot be scratched by it. If it's topaz, it should have internal iridescence and a perfect cleavage (or so they claim...).

There are very few minerals with non-metallic luster that can't be scratched by quartz.

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