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Malachite twinning
  
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RayStraw




Joined: 21 Jul 2018
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PostPosted: Mar 04, 2020 12:29    Post subject: Malachite twinning  

Someone claimed that all malachite is twinned.

Does anyone know of any discussion or papers to this effect?

Best,

Ray
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Birdbrain59




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PostPosted: Mar 04, 2020 18:09    Post subject: Re: Malachite twinning  

Thank you Ray for this post. I did not know what twinning was now I do. Always learning
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Sante Celiberti




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PostPosted: Mar 04, 2020 18:48    Post subject: Re: Malachite twinning  

RayStraw wrote:
Someone claimed that all malachite is twinned.

Does anyone know of any discussion or papers to this effect?

Best,

Ray



Never heard. I heard that all malachite is pseudomorph, although this claim isn't correct.
Best regards.
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John Betts




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PostPosted: Mar 05, 2020 09:58    Post subject: Re: Malachite twinning  

Any good mineralogical reference lists twinning as common on {100} and {201}. See Dana's Mineralogy or the Mineral Handbook. This forum makes it difficult to post links, but you can search for the latter and find it online.
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Johan Kjellman




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PostPosted: Mar 08, 2020 06:27    Post subject: Re: Malachite twinning  

RayStraw wrote:
Someone claimed that all malachite is twinned.

Does anyone know of any discussion or papers to this effect?

Best,

Ray


Order-disorder twinning of malachite
Makovicky, Emil (Institute of Geoscience and Natural Resources Management, University of Copenhagen, Østervoldgade 10, Copenhagen; 1350, Denmark); Merlino, Stefano Source: Canadian Mineralogist, v 57, n 4, p 475-488, 2019
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RayStraw




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PostPosted: Mar 08, 2020 06:50    Post subject: Re: Malachite twinning  

Thank you.

I bought and downloaded the paper.

Ray
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