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Quadro de mensagens em PortuguêsQuartzo citrino
12th Jul 2013 11:50 UTCAntónio Manuel Ináçio Martins
Obrigado.
Martins da Pedra
12th Jul 2013 12:07 UTCRui Nunes 🌟 Expert
"Citrine is a variety of quartz whose color ranges from a pale yellow to brown. Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes. It is nearly impossible to tell cut citrine from yellow topaz visually, but they differ in hardness. Citrine has ferric impurities, and is rarely found naturally. Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from Latin citrina which means "yellow" and is also the origin of the word "citron." Sometimes citrine and amethyst can be found together in the same crystal, which is then referred to as ametrine."
12th Jul 2013 12:39 UTCAntónio Manuel Ináçio Martins
A melhor definição possível, sendo que range ou faz ruído :-) entre o amarelo claro e o castanho.
Pergunto agora se efetivamente podemos considerar ao ficheiro em anexo e pela coloração do quartzo um CITRINO.
Obrigado.
Martins da Pedra
12th Jul 2013 13:07 UTCRui Nunes 🌟 Expert
imagino que este quartzo tenha apenas uma coloração exterior que facilmente sairá com uns mergulhos em ácido. Penso ainda que se quebrarmos um cristal o seu interior não terá a mesma coloração visível na foto. Se não é um exemplar flutuante, como aparente não ser, e se foi agora "arrancado", talvez a base apresente um aspecto mais leitoso e esbranquiçado.
De qualquer forma estou apenas perante uma foto e poderei estar a fazer juízos errados...
Saúde.
Rui
12th Jul 2013 14:18 UTCJorge Santos Garcia
Um quartzo citrino tem que ser transparente e o amarelo alaranjado estar incluído na estrutura cristalina.
Jorge
12th Jul 2013 15:53 UTCAntónio Manuel Ináçio Martins
Realmente este quartzo tem uma pelicula amarela e brilhante que faz parte da estrutura exterior dos cristais maiores, sendo o interior leitoso acinzentado. Em cristais diminutos verifica-se entre o hialino e o amarelo que verificando ao microscopio não me parece pelicula de óxido. Pela lógica do citrino este quartzo deveria apresentar-se completamente num amarelo transparente nos cristais maiores.
Rui e Jorge obrigado por me ajudarem a complementar o raciocinio sobre esta questão.
Martins da Pedra
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 4, 2024 23:28:49