FMF - Friends of Minerals Forum, discussion and message board

[Jordi Fabre]

In the Spanish Forum Carlos Utrera published this nice image of a micro from the Portuguese quarry of Folgosinho. He (and I) believes that the smaller crystals could be Paulkerrite and the larger one maybe too, but other people are sure that in fact the small crystals are Phosphosiderite and the large crystal could be another unknown species. Some one could help?

Jordi

[minerais]

Dear Jordi,

By my experience concerning Folgosinho mineral species, the samples with Paulkerrite are associated to Benyacarite, so its identification is not easy because both have very similar crystal form, although the Benyacarite have a yellowish-greenish color and the Paulkerrite is mostly colorless.
The Benyacarite appears also associated to Phosphosiderite and Hureaulite, as well as Stewartite and Strunzite, covering globular Phosphosiderite.
It was mined also Robertsite, well crystallized, on Phosphosiderite matrix (4 x 3 x 3 cm. specimen)

Best Regards,
José Gomes

Estimado amigo Jordi Fabre,pela experiencia que tenho sobre as ocorrencias minerais de folgosinho,as amostras que contém paulkerrite,estão associadas a benyacarite,a sua identificação é dificil,pois ambos os minerais tem cristalizações muito aproximadas,podendo se distinguir pela cor da benyacarite amarelo esverdeada,e a paulkerrite ser praticamente incolor,enbora com a mesma forma de cristais,é a minha conclusão depois de ver algumas centenas de amostras destes minerais.A Benyacarite aparece também associada a phosphosiderite e hureaulite,e também a stewartite e strunzite,recobrindo phosphosiderite esferica de primeira geração.Também foi encontrada Robertsite bem cristalizada(drusa com 4x3x3),com matriz de phosphosiderite.
Un saludo.
JOSÉ GOMES

[minerais]

Sample of Robertsite (macro) collected in Folgosinho on 2008
Best Regards
José Gomes

Exemplar de Robertsite(macro),recolhido em Folgosinho 2008.
Un saludo
José Gomes

[Jordi Fabre]

Thanks José. Considering how interesting your posts are I translated them to English. If you have the chance, in the future please try to do it yourself in order to help our readers to understand your very interesting texts.

Jordi