Tombarthite is a hydrohydroxysilicate of rare earths. It is found in one of the Precambrian granite pegmatite dykes in the Iveland-Evje area, South Norway. It has a monazite type structure with a=7.12 , b=7.27 , c=6.70 , β=102°30′ (average of two samples). The generalized formula is RE4(Si+4H)4O12−nOH4+2n, where O≦n≦4. RE are mainly yttrium and small lanthanons. The mineral is named after Professor Tom. Barth.

中文翻译：

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Tombarthite，一种来自挪威南部埃夫耶 Høgetveit 的新矿物

Tombarthite 是稀土的氢羟基硅酸盐。它发现于挪威南部 Iveland-Evje 地区的前寒武纪花岗岩伟晶岩脉之一。它具有独居石型结构，a=7.12，b=7.27，c=6.70，β=102°30'（两个样品的平均值）。通式为RE4(Si+4H)4O12-nOH4+2n，其中O≤n≤4。RE主要是钇和小镧系元素。这种矿物以汤姆教授的名字命名。巴特。