DR. HANNEMAN'S MINERAL COLLECTION WILL BE AVAILABLE FOR SALE IN THE NEAR FUTURE
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 Post subject: Sibling rivalry
PostPosted: Mon Jan 13, 2020 10:32 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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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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