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Whiskers in NWA 16100

NWA 16100 was 1,922 grams, in three pieces, of olivine bearing diogenite-melt rock. It contains vesicles which are apparent in this cut fragment and whiskers that are easily seen in thin section under magnification.
This cut fragment was sourced from Jason Whitcomb of https://www.handfulofspace.com/

 

 

 


Our excellent thin section was made by Erik Karadeema https://high-mesa-petrographics.square.site/ It is a standard 27 x 46 mm size, “double polished” and not covered.

 

 


The melt rock is fine grained.

 

 


Top right corner in cross-polarized light (XPL). Field of view (FOV) is 3.1 mm wide.

 

 


This is the bright yellow grain above. Note the whiskers on the dark inclusions. FOV = 0.3mm. XPL

 

 


The whiskers are not of uniform width along their length. FOV=0.1mm. XPL

 

 


FOV=0.05mm. Plane polarized light (PPL)

 

 


We will look closer at the green elongated grain in the center. FOV=3.1mm. XPL

 

 


FOV=0.5mm. XPL

 

 


Whiskers are seen on the inclusions at lower left. One expert I asked about these hadn’t seen them before and, predictably, asked if they’d been microprobed. Not that I know of. Maybe someone should do a paper on them. FOV=0.4mm. PPL

 

 


Whiskers possibly align with the mineral grain’s crystal structure. FOV=0.2mm. PPL

 

 


Note the center grain with three dark inclusions. FOV=3.1mm. PPL

 

 


Whiskers often appear more robust in one direction than in the other. FOV=0.3mm. PPL

 

 


Whiskers do not all lie in the plane of the section surface. These start from the body of the inclusion near the top surface of the sample and extend downwardly at roughly 45 degrees. FOV=0.15mm. PPL

 

 


FOV=0.3mm. PPL

 

 


Robust whiskers aligned NW-SE. FOV=0.15mm. PPL.

 

 


FOV=0.3mm. PPL

 

 


FOV=0.3mm. PPL

 

 


FOV=0.3mm. XPL

 

 


FOV=0.075mm. XPL
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