Three distinct layers across the cross-section, it looks chaotic and heterogeneous.
How to describe such rock?
The rock is mainly Sandstone but probably had been metamorphosed by hot quartz veins which later formed the greenish crystallised tourmaline at the mid-section. The top left side is light grey Sandstone while the bottom right is also mainly sandstone but had been permeated, weathered and stained by brown ferrous solution.
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