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The Mineral natrojarosite




Chemical Formula NaFe3+3(SO4)2(OH)6
Composition Basic hydrous sodium iron sulfate
Color Yellow-brown to brown
Streak Light yellow
Hardness 3 - 3.5
Crystal System Hexagonal
Crystal Forms
and Aggregates
Occurs only in tiny crystals, which are hexagonal or triangular shaped, and may also be tabular or pseudocubic. Also occurs grainy, as fibrous crusts, in nodules, and in thin, hexagonal scales.
Transparency Translucent
Specific Gravity 3.1 - 3.3
Luster Resinous to adamantine
Cleavage 2,1 - basal (usually cannot be determined)
Fracture Conchoidal, uneven
Tenacity Brittle
In Group Sulfates; Hydrous Sulfates
Striking Features Crystal habits and color
Environment Jarosite is a secondary mineral that forms through weathering in arid regions.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 3

Natrojarosite ON EBAY



NOTEWORTHY LOCALITIES
Natrojarosite has been found in Lavrion, Greece; the Francon Quarry, Montreal, Quebec, Canada; Rapid Creek area, Yukon Territory, Canada; and Palos Verdes Hills, Los Angeles Co., California.

COMMON MINERAL ASSOCIATIONS
Goethite, Pyrite, Galena, Barite

DISTINGUISHING SIMILAR MINERALS
Natrojarosite's crystal forms combined with its color easily identify it. However, poorly crystallized examples and massive forms of Natrojarosite may be difficult to distinguish from other minerals, such as Limonite. Natrojarosite is also indistinguishable from its isomorphous mineral Jarosite by ordinary methods.


 
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