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Sunday, December 22, 2024
HomeBirdMeteorwrongs...

Meteorwrongs…


…versus meteorites! Each week I obtain at the very least half a dozen e-mails from hopeful correspondents who assume they’ve discovered a ‘real meteorite’. They not often put it in these phrases, in fact: they’re often very positive of themselves to the purpose of abruptness. A typical e-mail would learn:

“I discovered this meteorite on my drive / the seashore / whereas strolling the canine. I do know it is a meteorite as a result of it is interested in a magnet / is nothing like I’ve seen earlier than / it appears to be like like those in your web site. Would you wish to make a wise supply for it?”

Within the thirty or so years I have been promoting and lecturing about meteorites solely a single particular person has ever proven me the actual article: the opposite (a number of thousand!) have principally been one or different of these within the picture beneath:

1) Marcasite: an iron sulphide mineral that happens in lumpy, spherical nodules in chalk or limestone areas
2) Slag: Again within the center ages many communities had small-scale iron smelters: the glassy residue is a standard sight even on nation walks. With the appearance of the railways, furnace slag was often used for rail beds.
3) Belemnite: The inner skeleton of those squidlike cephalopod molluscs are one of the vital widespread mesozoic fossils: even in latest instances they had been typically known as ‘thunderbolts’.
4) Haematite: This iron oxide ore can happen in lustrous, mammiform (look it up!) lumps.
5) Magnetite: One other iron oxide mineral: that is the one one of many above that’s interested in a magnet.
The ‘killer’ is that the majority meteorites check positively for nickel, which not one of the meteorwrongs above do.

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