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I found this stone on the way. It looks as same as in the attached photo. Some say it's quartz crystal and some say it's something else. Can anyone help me out?

unidentified crystal

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Judging by the appearance it could be either quartz or calcite. Try scratching it with a steel nail or knife blade. If the rock is scratched it is likely calcite. If the steel nail/knife doesn't scratch the rock it is likely quartz. This is because quartz is a 7 on the Mohs hardness scale, calcite is a 3 on the Mohs hardness scale and a steel nail/knife is around a 6.

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    $\begingroup$ There are other clear minerals that are as hard or harder than quartz. This appears to have an orthorhombic crystal form and it would not be quartz if that is the case. We really need some information on where it was found. If it is not scratched by a knife, try scratching it with a piece of quartz and try scratching a piece of quartz with it. To me it looks more like topaz but that would be quite a rare find. $\endgroup$ – haresfur Jan 1 '18 at 22:38

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