玉髓

SiO2

現有標本

Front view of botryoidal grape agate cluster from Sulawesi

葡萄瑪瑙晶簇 – 葡萄狀玉髓 – 印尼蘇拉威西

Front view of purple botryoidal grape agate from Indonesia

葡萄瑪瑙玉髓晶簇 – 紫色葡萄狀 – 印尼

Front view of vivid purple grape agate from Mamuju

葡萄瑪瑙玉髓 – 鮮紫色葡萄狀 – 蘇拉威西馬穆朱