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上(shang)水(shui)(shui)石(shi)(shi)(shi)的(de)(de)實質是(shi)碳酸鈣苔蘚植(zhi)(zhi)物(wu)化石(shi)(shi)(shi)，暄而(er)又(you)脆(cui)(cui)，良(liang)好的(de)(de)吸水(shui)(shui)石(shi)(shi)(shi)吸水(shui)(shui)性特別強。上(shang)水(shui)(shui)石(shi)(shi)(shi)由于(yu)(yu)暄而(er)脆(cui)(cui)易于(yu)(yu)造(zao)型，可隨意(yi)鑿(zao)槽、鉆洞(dong)(dong)、雕(diao)刻(ke)出各式(shi)各樣(yang)的(de)(de)形狀。上(shang)水(shui)(shui)石(shi)(shi)(shi)天(tian)然洞(dong)(dong)穴(xue)很多，有的(de)(de)互相(xiang)穿連通氣，小的(de)(de)洞(dong)(dong)穴(xue)如氣孔，這就是(shi)吸水(shui)(shui)性強的(de)(de)主要原因。在上(shang)水(shui)(shui)石(shi)(shi)(shi)上(shang)的(de)(de)洞(dong)(dong)穴(xue)中，填上(shang)泥土可植(zhi)(zhi)花草，大的(de)(de)洞(dong)(dong)穴(xue)可栽樹木，由于(yu)(yu)石(shi)(shi)(shi)體吸水(shui)(shui)性強，植(zhi)(zhi)物(wu)生(sheng)長茂盛，開花鮮艷。上(shang)水(shui)(shui)石(shi)(shi)(shi)可以散發濕氣，用它造(zao)假(jia)山(shan)或盆景，都有濕潤(run)環境的(de)(de)作用。

上(shang)水(shui)石(shi)(shi)(shi)又(you)稱(cheng)吸(xi)水(shui)石(shi)(shi)(shi)，盆中(zhong)蓄水(shui)后，頃(qing)刻可(ke)吸(xi)到頂端。石(shi)(shi)(shi)上(shang)可(ke)栽植野草、蘚苔，青翠蒼潤，為制作盆景的佳石(shi)(shi)(shi)。 沙(sha)積石(shi)(shi)(shi)，暄(xuan)而(er)脆，但吸(xi)水(shui)性很(hen)強；石(shi)(shi)(shi)灰石(shi)(shi)(shi)硬度稍(shao)高，結構比沙(sha)積石(shi)(shi)(shi)細密。上(shang)水(shui)石(shi)(shi)(shi)易于(yu)造(zao)型，由(you)于(yu)暄(xuan)而(er)脆，可(ke)隨意鑿槽(cao)、鉆洞、雕刻出心中(zhong)理想的形象。