Unknown rock

[Tina78]

Hi .
My daughter recently went to Cuba and she found a rock there for me she said its the only rock dhw could find walking the beach.. does Anyone one know what it is?

 

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[Kray Gelder]

Hard to say. It's crystalline, so my guess would be calcite, or quartz.

 

[T.C.]

It would help if you took more than one picture. Also, outside in natural light is best.

 

[Lygore]

It looks to me as quartz with carnelian agate around the base. Polish the sides if you can, the bands will be quite nice!

 

[Eu_citzen]

See if a knife scratches it.
Calcite, aragonite are a few possibilities. See if it reacts with vinegar.