SiO2 tagged posts

Photograph of lunar meteorite NWA 2727. Credit: Photo by Masahiro Kayama, Tohoku University

A team of Japanese scientists led by Masahiro Kayama of Tohoku University’s Frontier Research Institute for Interdisciplinary Sciences, has discovered a mineral known as moganite in a lunar meteorite found in a hot desert in northwest Africa. This is significant because moganite is a mineral that requires water to form, reinforcing the belief that water exists on the Moon.

“Moganite is a crystal of silicon dioxide and is similar to quartz. It forms on Earth as a precipitate when alkaline water including SiO2 is evaporated under high pressure conditions,” says Kayama. “The existence of moganite strongly implies that there is water activity on the Moon...

1. Cristobalite crystals from Harvard Mineralogical Museum, found at Ellora caves in India. Credit: RRUFF Project / University of Arizona
2. A fresh impact crater on Mars, as imaged by the HiRISE camera on board NASA’s Mars Reconnaissance Orbiter. Credit: NASA/JPL/University of Arizona

X-ray analysis reveals unexpected behaviour of silica minerals. With high-pressure experiments at DESY’s X-ray light source PETRA III and other facilities, a research team around Leonid Dubrovinsky from the University of Bayreuth has solved a long standing riddle in the analysis of meteorites from Moon and Mars. The study, published in the journal Nature Communications, can explain why different versions of silica can coexist in meteorites, although they normally require vastly different conditions to form...