台灣北投石刻面圓珠5.5毫米半串或1串珠（約15英吋/37公分）
北投石
尺寸：約 5.5-6mm (+/-0.5mm)
孔徑：約 1mm
顏色：象牙白、米色
這些是台灣北投石的圓形半圓形切割珠。北投石是一種會釋放天然輻射的天然礦石，僅存在於兩個地點：台灣的北投溫泉和日本秋田縣的玉川溫泉。在日本，它於1922年被指定為天然紀念物，1952年被指定為特別天然紀念物，現已禁止開採。據說它因含有鐳而釋放輻射，據信具有促進健康的功效。市面上常見的圓珠北投石多為陶瓷加工品。我們的產品也經過類似加工，其特點是品質、形狀和輻射釋放穩定。
[*圖片中的網格為 1 厘米 x 1 厘米。]
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