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 Post subject: Sibling rivalry
PostPosted: Mon Jan 13, 2020 10:32 am 
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Joined: Sun Jun 28, 2009 9:56 am
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Each of my six brothers has his own room, but I'm the only one who doesn't have any mirror in his room. What does my room look like?


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 Post subject: Re: Sibling rivalry
PostPosted: Wed Jan 15, 2020 5:49 am 
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Joined: Wed Sep 15, 2010 4:12 am
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Location: Belgium
Like a triclinic crystal ?

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http://www.gemsdat.be/engels.htm


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 Post subject: Re: Sibling rivalry
PostPosted: Wed Jan 15, 2020 6:24 am 
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Yes! Answer is indeed triclinic.

The seven crystal systems (seven "brothers" in total), and in regard of their symmetry elements, the triclinic lattice ("triclinic room") is the only one which doesn't feature any mirror plane.


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