The mineral chalcopyrite usually is found in compact masses or in mixtures with various other mineral as opaque, brass-yellow, tetragonal crystals.

黄铜矿通常以不透明的黄铜色的四角形结晶的方式在紧密物质或和其他各种矿物质混合体中被发现。

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Despite now being opaque, Ropars suggests that it is both the right shape and density to be Icelandic spar -- a mineral the team has proven to be able to pinpoint the concealed sun accurately.

ENGADGET: Alt-week 3.9.13: Sunstones, knotted vortices and a zero-g robot