A rare feature – hexagonal pitting
Diamonds occur in many colours, shapes, sizes and transparencies. Sometimes they just look like sand (well, expensive, very expensive sand, as a lowly 10 USD/carat stone is worth more than gold – currently hovering 1.200 USD/oz); or else diamonds may be broken (chips), dotted in the inside with other minerals, eroded or pitted at the surface, colourless, slightly tinted or, rarely, fancy (marked tints).
The rough diamonds in this parcel are from the Diamantina region (Jequitinhonha river) in Minas Gerais (Brazil). This is an historic diamond district, originally found and discovered in the early 17th century during Brazil’s colonial period. Diamonds in the area tend to have a greyish tint; alas, this is not their body color (as they would be extremely rare and expensive), just the color of a shallow coating probably due to radiation.
This photo illustrates a rare diamond feature caught by chance on camera. Note the focused diamond on the right hand side; it has a triangular shape (locally know has chapéu de frade). On the center of the diamond there is a depression of rare hexagonal shape, unlike trigons diamond’s characteristic inverted pyramidal pits.
JUST PUBLISHED BY LNEG
Mineral Occurrences – South of Portugal 400k map
For all those interested in Portuguese mineral deposits, LNEG (the Portuguese Geological Survey), has just released a pdf version of Mineral Occurrences in the South of Portugal (400K scale). With a diverse geology and home to important metallogenic provinces – including but not limited to W, Au, U and complex sulphides Cu, Zn, Pb – Portugal has seem some recent exploration activity by international companies.
To know more look at www.lneg.pt . Drop us a line – firstname.lastname@example.org – if you are interested in investing in Portuguese mineral projects.
Na selva equatorial de Mayoko (Congo)
Até na selva de Mayoko, o Sporting chega (em) primeiro.
Campeão Nacional de Equipas 2013 de Judo em Seniores, Juniores e Cadetes, em primeiro até no futebol no Natal e Ano Novo! Dois leões aproveitam a maré e festejam na selva tropical do coração de África (no Congo, a fronteira do Gabão mesmo ali ao lado).
Cruzam-se aqui muitos caminhos: trabalho, viagens, África, amizade, geologia, tantalite, Portugal, Congo, judo e desporto – claro, o Sporting. Uma imagem, mil significados.