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rock found in Macedonia

Can someone help me identify this rock? Also, will it react to acid?

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closed as unclear what you're asking by Spencer, JeopardyTempest, daniel.neumann, Semidiurnal Simon, Trevor J. Smith Oct 23 '18 at 14:38

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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The mottled blue appearance of the host rock looks very much like a rodingite or serpentinite. These rocks appear in ophiolites, and Macedonia has many ophiolites.

Discard this rock. It may contain asbestos.

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  • $\begingroup$ I'd second the recommendation regarding asbestos - possibly the white mineral on this rock. I have a rock containing asbestos that looks very similar to this and keep it in a ziplock bag out of site. $\endgroup$ – user11318 Oct 19 '18 at 10:42
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Your rock looks like limestone with an inclusion of re-crystallized calcite (The white part). A hardness test would help confirm the identification but reaction to acid is a strong indication of limestone.

From what I can make of the background there is even more limestone on the ground, either from a talus slope on a mountain or perhaps large crushed rock. Limestone is commonly used for surfacing driveways, it is also mined in large quantities for the production of lime and quick lime used in the manufacturing of cement and mortar.

Can I ask for some more specific information on where in Macedonia your sample was collected? What type of location, etc.

Edit: I miss read the question, in particular about the acid test. I thought an acid test had been completed and there was a positive reaction. My answer depends on a positive acid test. If the acid test was not completed I wouldn't depend on my answer.

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  • $\begingroup$ +1 I've made a small edit; I don't think you want GPS coordinates as much as a better understanding of the site's geography/geology. $\endgroup$ – uhoh Oct 19 '18 at 4:00

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