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Allende CV3

It is surprising how many interesting features are in this rather scruffy looking sample.

 

 

The space interstitial to the olivine bars of this BO chondrule appears to be partially crystallized instead of glassy. This shows more clearly in the next photo, below.

 

 

With polarizing filters turned so the olivine bars are in extinction the crystallized mesostasis stands out as light between the dark bars. Three closer views are at the end of this series of photos.

 

 

Maybe the bars were disrupted before the final rim formed.

 

 

Similar to relict mineral grains, this appears to be a relict chondrule.

 

 

At least three domains of bars, each with its own section of rim.

 

 

Olivine grains and opaques grading smaller toward the outside of the chondrule.

 

 

Different textures.

 

 

Amoeboid olivine aggregates.

 

 

Chondrule apparently assembled in layers from chondrule parts, opaques, mineral grains and dust.

 

 

The layers are more apparent in plane polarized light.

 

 

In incident light some of the opaques that show specular luster are probably metal/sulfide layers, even occurring beyond a dust layer (at top of photo extending from near center toward the left).

 

 

Closer view of the first chondrule in this series. Bars in optical continuity with the rim.

 

 

Plane polarized view displays opaques in the rim.

 

 

In this cross-polarized view the rim and olivine bars are in optical extinction. Instead of a glassy mesostasis it appears to have crystallized in a fibrous radial fashion among the olivine bars.

 

John Kashuba

John Kashuba

John is a natural history enthusiast living in Oregon.
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