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Sillimanite
Images: 
By I_gotta_rock
Taxonomy
Sillimanite
Kingdom: n/a
Phylum: n/a
Class: n/a
Order: n/a
Family: n/a
Genus: n/a
Species: n/a
Geological Time Scale
Eon: Phanerozoic
Era: Paleozoic
Period: Ordovician
Epoch: Late
Stratigraphy
Wissahickon Formation
Provenance
Collector: me
Date Collected: 08/01/2010
Acquired by: Field Collection
Location
Brandywine Springs Park
New Castle County
Delaware
United States
Comments
Sillimanite, AKA Fibrolite, is an aluminum-rich mineral occurring in metamorphic rock. The long, parallel crystals give it a woody texture and it can easily be mistaken for petrified wood.
Sillimanite is the State Mineral of Delaware.
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