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Gemstones 250x250

The Mineral natrojarosite

Massive Natrojarosite

Chemical Formula

NaFe3+3(SO4)2(OH)6

Color

Yellow-brown to brown

Crystal System

Hexagonal

Properties

Streak
Light yellow
Hardness
3 - 3.5
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

Crystal Habits

Only in very small crystals, which are hexagonal or triangular shaped, and may also be tabular or pseudocubic. Also grainy, as fibrous crusts, in nodules, and in thin, hexagonal scales.

Additional Information

Composition
Basic hydrous sodium iron sulfate
In Group
Sulfates; Hydrous Sulfates
Striking Features
Crystal habits and color
Environment
As a secondary mineral that forms through weathering in arid regions.
Rock Type
Sedimentary, Metamorphic

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

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.

natrojarosite Photos



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