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The Arthur Ross Terrace will be closed this morning, Tuesday, October 21, for a private cultural observance. You many observe smoke and/or fire coming from the Terrace at that time. The FDNY has been notified in advance, and all safety precautions are in place. The Terrace will reopen at 1 pm.

C.5.2. Widmanstätten pattern hero.JPG

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Widmanstätten pattern

Widmanstätten pattern

  • Exhibition Text

    • In the cores of differentiated asteroids, iron crystallized in a pattern not found on earth.

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  • For Educators

    • Topic: Earth Science

      Subtopic: Meteorites

      Keywords: Asteroids, Astrogeology, Astrophysics, Iron-nickel alloys, Meteorites, Iron, Mineralogy

      Audience: General

In This Section

C.5.2.1. Coahuila. Crystals to big to see.jpg

Coahuila

No crystal pattern is visible in Coahuila, because the entire meteorite is part of a single, immense crystal.

C.6.2.2. Linwood.jpg

Linwood

In meteorites with the coarsest patterns, such as Linwood (above) and Mount Joy (right), the crystals are not flat plates. 

C.6.2.2. Mount Joy. Coarse crystals.jpg

Mount Joy

In meteorites with the coarsest patterns, such as Linwood (above) and Mount Joy (right), the crystals are not flat plates.

C.5.2.3. Carlton (AMNH 116) . Medium and fine crystals.jpg

Carlton

These medium- and fine-grained meteorites have much thinner crystals than the coarse-grained samples above.

C.5.2.3. Owens Valley (AMNH 2636) Medium and fine crystals.jpg

Owens Valley

These medium- and fine-grained meteorites have much thinner crystals than the coarse-grained samples above.

C.5.2.4.  Gibeon (AMNH 210). Look closely.jpg

Gibeon

A dark band of iron sulfide marks the boundary between two sections of crystals that grew until they ran into each other.

C.5.2.5. Crystals too small to see hero.jpg

Tinnie

Tinnie is an ataxite, meaning it has a very fine-grained crystal pattern.

C.5.2.6. Willamette (AMNH 234). Broken Crystals B.jpg

Willamette

Willamette once had a Widmanstätten structure similar to the one in Owens Valley (above).

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