But, unlike the cores of the inner planets, the Moon's core contains little or no iron, while the typical planet-forming materials were quite rich in iron.

但是，与内行星的核心不同，月球的核心几乎不含铁，而典型的行星形成物质则富含铁。

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The ore-forming materials were derived from the mantle.

成矿物质初始来源于地幔。

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Until now, some studies showed that major source of ore-forming materials come from wall rock or upper mantle.

目前，有关研究认为此类矿床成矿物质主要来源于矿床的围岩或上地幔。

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But the samples we collected from it we believe to be exactly the same materials that went into forming the comets and the solar system four and a half billion years ago.

NPR: Stardust Set to Deliver Comet Samples

Clays are water-loving materials (just ask any friends who make pottery), sometimes forming from the interaction of water and different kinds of precursor volcanic rocks, and holding much of that water within their mineral structures.

CNN: Have a drink on Mars