most of those rocks should be fine including that quartzite. Tho only rock I don't like the looks of the lone rock in the lower right it appears to be a shirt and without a close look I can't tell for sure but the rest look finePlantedRich,
Thanks for your information. Since the sandstone would be degraded in water,I just threw away those sandstones and got some of others. Do you think these stone will be Ok?
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