416 G. p. MERRILL ON METAMORPIIISM IN METEORITES 



Figure 3. — Photomicrograph from a thin-section of fragment of Allegan stone 

 that had been heated in a gas blast furnace. 



Figure 4. — Barred chondrule with interstitial glass from Beaver Creek stone — 

 a crystalline spherulitic chondrite. 



Plate 5. — Photomicrographs of Meteorites 



Figure 1. — Photomicrograph from thin-section of the Alfianello, Italy, stone — 

 an intermediate chondrite, showing interstitial areas of maskely- 

 nite. 



Figure 2. — Photomicrograph from thin-section of Dhurmsala stone — an inter- 

 mediate chondrite, showing pyroxene crystal crushed between 

 two chondrules. 



Figure 3. — Polished slice of Cullison stone, showing structure lines. 



Plate 6. — Photomicrographs of Meteorites 



Figure 1. — I'hotomicrograph from thin-section of the Parnallee stone, show- 

 ing twinned pyroxene crystal bent and broken against a massive 

 chondroidal form. 



Figure 2. — Photomicrograph from thin-section of Troup, Texas, stone — an in- 

 termediate chondrite, showing large enstatite crystal shattered 

 and disintegrated along the borders. 



Figure 3. — Photomicrograph from thin-section of Parnallee, India, stone — a 

 gray chondrite, showing secondary distribution of the metal. 



Figure 4. — I'olished slice of the Cumberland Falls, Kentucky, meteoric brec- 

 cia — a whitlj'ite, showing secondary deposition in fine plates be- 

 tween the silicates of the dark fragment and between the frag- 

 ment and the enstatite breccia. 



