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Boehmite and Natrolite

The Mineral boehmite




Boehmite, also spelled as Böhmite, is one of the three component minerals of the economically important aluminum ore Bauxite. It is named after German mineralogist Johann Böhm.
 
Chemical Formula AlO(OH)
Composition Basic aluminum oxide
Color White, light gray, light yellow, light yellow-green
Streak White
Hardness 3 - 3.5
Crystal System Orthorhombic
Crystal Forms
and Aggregates
Crystals, which are tabular or short prismatic, form in tight groups and are very small. Most often in fine-grained scaly masses, pisolitic, and massive.
Transparency Translucent
Specific Gravity 3 - 3.1
Luster Vitreous
Cleavage 1,1;2,1;3,1
Fracture Uneven
Tenacity Brittle
In Group Oxides; Hydroxides
Striking Features Formation habits and mode of occurence
Environment As a secondary mineral forming in the weathered surface zones in clay deposits and limestones, as well as low-silica igneous rocks and pegmatites.
Rock Type Igneous, Sedimentary
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 1


Boehmite ON EBAY
OTHER NAMES
Bohmite Synonym of Boehmite. Usually spelled in the native German Böhmite.

POLYMORPHS
Diaspore


USES
Boemite, being an important component of Bauxite, is an important ore of aluminum.

NOTEWORTHY LOCALITIES
Although common as a constitute in Bauxite deposits, Boehmite is very poorly represented as specimens. The locality of Saga 1 Quarry, Mørje, Telemark, Norway has produced good microcrystals of Boehmite.

COMMON MINERAL ASSOCIATIONS
Gibbsite, Diaspore, Calcite, Kaolinite, Natrolite, Nepheline



boehmite PHOTOS
 
ADDITIONAL RESOURCES
 
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