Hello!
The photos are quite low rez, but it looks like marble to me. Limestone has a smoother texture, while marble is grainier.
Indeed, better-resolution rocks would help identify the stone. It does appear metamorphic. However, I would say schist or gneiss, rather than marble. Try a 10% HCl test, shist or gneiss will not have a fizzling reaction to it.
I do not know where the material comes from but nevertheless the HCl test is mandatory.
It is always fraught with uncertainties to provide any classificaton in this remote controlled way but my first glance made me think of a garnet-bearing crystalline (metamorphic) rock with a gray-green matrix. I know it is very daring but many speaks in favor of an amphibolitic eclogite (?)
HGD
Limestone becomes marble during metamorphic process and according to the questions, samples should be marble.
Samples are deformed with some showing garnet minerals. Regardless the low resolution of these samples, I'm not sure it is marble. You should go with HCl test as advised by Rok Gašparič and Hrvoje Vučemilović , you might be surprised. Check rock types of low- to relatively high-grade metamorphic rocks.
Kevin
hello dear Hamza,
Is better to make a thin section but its look like a retrograde eclogite but none of marble or grey limestone. The pixel of the picture is not good, maybe due to many transfers....
Thanks for the feedback, but if I go with the HCl test, the sample will fizzle either way because both marble and gray limestone are carbonate rocks.
Try to see whether the carbonate grains are locked together under microscope. If they are so, then it is probably marble.
Are you getting metamorphic foliation?
In the low resolution photos, it does not look like limestone or marble. The HCl test is to see whether it is actually a carbonate rock, or whether both options are in correct.
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