from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral with rhombohedral crystals, KFe33+(SO4)2(OH)6.
from the GNU version of the Collaborative International Dictionary of English
- n. An ocher-yellow mineral occurring in minute rhombohedral crystals. It is a hydrous sulphate of iron and potash.
from The Century Dictionary and Cyclopedia
- n. A native hydrous sulphate of iron and potassium, occurring in ocher-yellow rhombohedral crystals, and also in granular masses.
- n. Varieties of this mineral in which the potassium is replaced by sodium and by lead have been called natrojarosite and plumbojarosite respectively.
Expedition leader Professor Groemer, who is based at the University of Innsbruck in Austria, explains: "We have a mineral here called jarosite - and that is exactly what we have on Mars."
Orange layers are colored by jarosite, an iron-rich sulfate mineral.
From 176 to 180 feet, samples indicated limonite-jarosite and hematite in the matrix material and it is believed that this zone could also offer gold mineralization.
Nickel producers will benefit from a new direct solvent extraction process for recovering nickel and cobalt, and research into jarosite build up in autoclaves during high-pressure acid leaching.
The jarosite group minerals have received increasing attention since the discovery of jarosite on the martian surface by the Mars Exploration Rover Opportunity.
The two scientists, according to sources at the Sunday meeting, based their case in part on Mars’ fluctuating methane signatures that could be a sign of an active underground biosphere and nearby surface concentrations of the sulfate jarosite, a mineral salt found on Earth in hot springs and other acidic bodies of water....
Similarly, when the Opportunity rover discovered the mineral jarosite on Mars, scientists hailed the find as a strong clue that liquid water once flowed there (