I went hiking and I found this rock with something inside. I would like to know what it is.


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    $\begingroup$ Please add the location where you found the rock. Nearby city/town, county, state or province and country. Blue mineral is interesting, might apatite, calcite, fluorite or something more unusual. $\endgroup$ – Gary Kindel Jun 21 '17 at 12:24
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    $\begingroup$ On top of what Gary Kindel says, please follow this guide on how to ask rock ID questions. $\endgroup$ – gerrit Jun 21 '17 at 13:14
  • $\begingroup$ It looks somewhat like flint forming in limestone. $\endgroup$ – blacksmith37 Jun 21 '17 at 20:17
  • $\begingroup$ I'm with @GaryKindel it has a very "fluorite"ish feel to it, but we need more details to answer positively. $\endgroup$ – Gimelist Jun 25 '17 at 10:23
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    $\begingroup$ My first impression was fluorite. It's perhaps the most common blue macrocrystalline mineral. The usual hardness tests would help as well as HCl test, etc. Placing under UV light might shed some .... light (excuse the pun) on the matter. $\endgroup$ – Ton Jun 29 '17 at 10:06