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NWA 2798 L3.2

As might be expected, NWA 2798 L3.2 contains large, well defined chondrules and dark matrix. It also displays quite a variety of barred olivine features – coarse and fine, simple and otherwise.

These thin section photos are from just two slides. The first six are from one and are all at the same scale with the fields of view 3.1 mm wide. The remaining ten are from the other slide and are at several scales. Please see captions for chondrule sizes or their FOV. All thin section photos are in cross polarized light.

For the record, there is no such thing as “cross polarized light.” “In cross polarized light,” and similar spellings, is shorthand for the procedure when linear polarized light is shown through a transparent or translucent substance and the transmitted light is viewed through a linear polarizing filter that is oriented at a right angle to the polar orientation of the source light. Other terms for this are “using crossed Nicols,” “with analyzer in,” “xpols” and “XPL.”

 

Slice from which these thin sections were made. Maximum length is 45mm.

 

 

 

 

 

 

These six photos are from a single thin section and all at the same scale with their fields of view 3.1mm wide. The apparent size of the small BO chondrite in the last photo is exceptionally small for this meteorite.

 

Chondrule is 3.5mm long containing fine mineral grains and large—some of which are skeletal euhedral olivine crystals.

 

Field of view is 3.1mm wide. A few long skeletal grains.

 

A compound cryptocrystalline chondrule 1.4mm in diameter.

 

Chondrule diameter is 0.9mm.

 

Chondrule diameter is 1.1mm, more if the dust jacket is considered.

 

Cratered radial pyroxene chondrule 2.7mm in dimaeter.

 

Chondrule is 4.7mm in diameter.

 

Chondrule is 4.4mm tall. Fine olivine bars occupy the center.

 

This fragment is 5.2mm tall.

 

A complex bundle of bars 2.2mm long.
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