The source of diamonds in the Diamantina (Minas Gerais) region: Fm. Sopa – Brumadinho


The precambrian Sopa Conglomerate is the source for modern alluvial diamonds deposits in the Diamantina (Minas Gerais) region. This old secondary formation is being reworked by the rivers in the area, releasing the diamonds it stores (themselves originated in primary, still unidentified, sources) into modern alluvia. Both the old conglomerate (Fm. Sopa – Brumadinho – … Continue reading The source of diamonds in the Diamantina (Minas Gerais) region: Fm. Sopa – Brumadinho

Diamonds in the Chapada Diamantina – Bahia, Brazil


Just before starting a new trip to Brazil (into manganese mineral deposits in Goiás and Minas Gerais), this is a new photogallery for a 2004 road trip aimed at learning about the Bahia diamond deposits (geology, formation, history, social and natural settings). Of course, it was just the perfect pretext for four old friends getting … Continue reading Diamonds in the Chapada Diamantina – Bahia, Brazil

Coloured diamonds from Brazil (Bahia?)


A friend that knows I like diamonds (and other minerals and rocks) sent me a picture of a Brazilian parcel (alas, they always gift me pictures, never the stones themselves). It is a really nice looking parcel of coloured diamonds (mind you, not so long ago many of these stones would be dismissed as industrials). I have studied … Continue reading Coloured diamonds from Brazil (Bahia?)