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The Mineral natrojarosite
Chemical Formula
NaFe
3+
3
(SO
4
)
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
nodule
s, 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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