Geological Time Scale
Date Collected: 08/01/2010
Acquired by: Field Collection
Brandywine Springs Park
New Castle County
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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