YANOMAMITE with Scorodite Cassiterite, Topaz and Quartz - Goiás, Brazil

YANOMAMITE with Scorodite Cassiterite, Topaz and Quartz

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Yanomamite is an extraordinarily rare indium arsenate hydrate described in 1994 from a tin deposit in northern Goiás state, Brazil. Its rarity, even within this deposit, is unsurprising given that there are very few indium-bearing minerals known. Material from that discovery was very limited and rarely comes up for sale. This classic specimen of porous Topaz-Quartz matrix is pocketed with cavities containing primary Cassiterite and secondary Scorodite and Yanomamite. The Yanomamite was marked with an arrow, although this is absent on the video. It forms waxy greenish-yellow platy microcrystals within cavities sometimes coated with white powdery Scorodite. It is from the superb systematic collection assembled by brothers Martin and Michael Günther (1951-2007 & 1956-2021).