Tieschitz H/L3.6

Tieschitz is interesting in thin section. In our sample, large and small chondrules are set apart by opaque matrix. Radial pyroxene and cryptocrystalline chondrules display aqueous alteration. One large chondrule contains several relict grains. We see chondrules that appear to be radial olivine darkened with fine included particles, probably amphiboles or other alteration products, and by rust stains. There is one chondrule containing finely dendritic olivine.

 

Overview 7.3 mm wide. A variety of large and small chondrules are set apart by opaque matrix. The brown radial pyroxene chondrule below and left of center has a lighter colored edge. ‘Bleaching’ is the result of the aqueous removal of feldspathic glass from between the pyroxene laths. Tieschitz H/L3.6.

 

Large chondrule containing several ‘dusty’ relict grains – olivine grains with myriad minute dark inclusions. The chondrule is surrounded by a broad dark rim. Field of view is 3.1mm wide. Tieschitz H/L3.6.

 

An aggregate of fine mineral grains surrounding an opaque circular bleb of metal all surrounded by a dark rim. Dark radial olivine chondrule at top right. FOV=3.1mm. Tieschitz H/L3.6.

 

Radial olivine chondrule. It is darkened by many minute dark inclusions and by a rust stain (here, at top). The rim passes light more readily due to aqueous ‘bleaching’. FOV=0.6mm. Tieschitz H/L3.6.

 

Dark radial olivine chondrule at center. FOV=3.1mm. Tieschitz H/L3.6.

 

Radial olivine chondrule darkened by fine inclusions. FOV=0.5mm. Tieschitz H/L3.6.

 

Dark radial olivine chondrule at left and bright radial olivine fragment at right. FOV=3.1mm. Tieschitz H/L3.6.

 

Radial olivine chondrule darkened by inclusions and with outside bleached. FOV=0.9mm. Tieschitz H/L3.6.

 

Radial olivine fragment. FOV=0.7mm. Tieschitz H/L3.6.

 

Two quite different barred olivine chondrules at center. Barred chondrules derive from fully molten droplets. FOV=3.1mm. Tieschitz H/L3.6.

 

The same two barred olivine chondrules. FOV=0.9mm. Tieschitz H/L3.6.

 

Dendritic olivine chondrule below and right of center. FOV=3.1mm. Tieschitz H/L3.6.

 

Dendritic olivine chondrule. Diameter = 0.6mm. Tieschitz H/L3.6.

 

Dendritic olivine chondrule. FOV=0.4mm. Tieschitz H/L3.6.

About the Author

John Kashuba
John is a natural history enthusiast living in Oregon.
Top