Edoylerite, metasideronatrite, and sideronatrite
, which also feature in the list of the 2,500 rarest minerals, decompose instantly when exposed to sunlight, while hatrurite - discovered in the Hatrurim Formation in Israel - only forms at a temperature of over 1,250 degrees Celsius (2,282 degrees Fahrenheit).
They include sideronatrite
, which had previously only been found in deep underground mine workings in Northumberland in 1966.
on Krohnkite, Chuquicamata, Chile, no.
Fitzpatrick and his colleagues from CSIRO and the CRC for Landscape Evolution and Mineral Exploration have recently shown that two bright yellow mineral precipitates -- sideronatrite
and natrojarosite -- form in extremely acid and saline soils.
Sideronatrite [Na.sub.2][Fe.sup.3+][([SO.sub.4]).sub.2](OH)[center dot]3[H.sub.2]O
Ahlfeld and Reyes (1955) report silky orange sideronatrite associated with voltaite in the ancient workings.
Dave also had orange, splintery, acicular sideronatrite
crystals (to 1 cm) in sulfur from the Sulfur pit, Crescent Valley, Eureka County.