Yellow-brown to brown
3 - 3.5
3.1 - 3.3
Resinous to adamantine
2,1 - basal (usually cannot be determined)
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
Distingushing 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.