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26 Jul-13:21:53 Re: collection of volkmar stingl (Volkmar Stingl)
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25 Jul-10:49:33 Re: celestite geode in dolomite block? or what, halite? (Corneldumitru)
25 Jul-08:13:07 Re: celestite geode in dolomite block? or what, halite? (Bob Morgan)
25 Jul-02:46:09 Re: celestite geode in dolomite block? or what, halite? (James Catmur)
24 Jul-14:52:13 Re: black, metallic, yellow oxide? (Linus)
24 Jul-14:41:03 Re: collection of michael shaw (Michael Shaw)
24 Jul-13:47:19 Celestite geode in dolomite block? or what, halite? (Corneldumitru)
24 Jul-12:18:05 Re: black, metallic, yellow oxide? (Johan Kjellman)
24 Jul-10:26:19 Re: collection of volkmar stingl (Volkmar Stingl)
23 Jul-18:40:43 Re: black, metallic, yellow oxide? (Bob Carnein)
23 Jul-17:36:31 Re: black, metallic, yellow oxide? (Linus)

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Melanophlogite?
  
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Luiz Oliveira




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PostPosted: Apr 06, 2021 14:38    Post subject: Melanophlogite?  

Gostaria de informações sobre a Melanoflogita! Tenho umas amostras que parecem ser opala, cristobalita, Melanoflogita, calcedônia, cordierita! Isto, porque são rochas(bombas vulcânicas)! Quando cálculo o peso específico, tenho um resultado de 2,61, 2,57, 2,65! Porém, quando diminuo as amostras o peso específico vai caindo até 2,2! A dureza é em torno de 7 a 7,5. Juntamente com estes agregados, tenho vidro vulcânico de gravidade específica de 2,66!
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Bergur_E_Sigurdarson




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PostPosted: Apr 06, 2021 14:56    Post subject: Re: Melanophlogite?  

Try mindat?

https://www.mindat.org/min-2630.html
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Luiz Oliveira




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PostPosted: Apr 06, 2021 17:24    Post subject: Re: Melanophlogite?  

Eu já havia pesquisado no mindad! Porém não consegui boa elucidação! Acredito que a dificuldade está no tamanho dos cristais que são pequenos para fazer cálculo de gravidade específica!


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Bergur_E_Sigurdarson




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PostPosted: Apr 06, 2021 17:42    Post subject: Re: Melanophlogite?  

Sounds like you need a lab to test your samples.
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Jordi Fabre
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PostPosted: Apr 07, 2021 01:54    Post subject: Re: Melanophlogite?  

Bergur_E_Sigurdarson wrote:
Sounds like you need a lab to test your samples.

And also seems that you should publish your text in English language.
Please use the Google translator or similar before publish your messages in Portuguese language. Thank you.
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Luiz Oliveira




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PostPosted: Apr 07, 2021 13:20    Post subject: Re: Melanophlogite?  

Boa tarde! Eu tentei usar o google tradutor, porém a tradução não foi fidedigna ao meu texto original! Espero a compreensão de todos! Mas além de me indicarem um laboratório, alguém mais pode dar sua opinião?
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Pete Richards
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PostPosted: Apr 07, 2021 13:27    Post subject: Re: Melanophlogite?  

From the photograph, I would have to guess quartz, maybe including broken fragments of a fine-grained quartz like jasper. Of the options you list, none is reasonable except chalcedony, both because they look different and most are quite rare. Chalcedony is fine-grained quartz, but that term usually suggests a different appearance than your rock.

DeepL translation:

A partir da fotografia, teria de adivinhar o quartzo, talvez incluindo fragmentos quebrados de um quartzo de grão fino como o jaspe. Das opções listadas, nenhuma é razoável, excepto a calcedónia, ambas porque parecem diferentes e a maioria são bastante raras. A calcedónia é quartzo de grão fino, mas esse termo sugere normalmente uma aparência diferente da sua rocha.

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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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James Catmur
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PostPosted: Apr 07, 2021 13:31    Post subject: Re: Melanophlogite?  

Hoje falamos portugues

Today we work in Portuguese.
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Luiz Oliveira




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PostPosted: Apr 07, 2021 13:50    Post subject: Re: Melanophlogite?  

Estou mandando uma foto melhor!


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Luiz Oliveira




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PostPosted: Apr 07, 2021 13:55    Post subject: Re: Melanophlogite?  

My hypothesis is that it’s a beta cristobalite who’s been metamorphosed into Melanoflogite!


A minha hipótese é que seja uma cristobalita beta que sofreu metamorfose para Melanoflogita!
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Luiz Oliveira




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PostPosted: Apr 09, 2021 10:26    Post subject: Re: Melanophlogite?  

Tenho outras amostras! Mas o que me chama muito a atenção, é quando após lapidar no disco de corte as pedras ficam escuras no polimento! Li que a Melanoflogita fica preta quando aquecida! E essa cristã escura atrapalha o brilho e a bela aparência da gema! Mas aprendi a deixar a superfície quase limpa durante 3 anos de estudo!


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