Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1984, Page 50

Náttúrufræðingurinn - 1984, Page 50
Mynd 6. Dæmigert öskukorn úr nálalaginu efra. f>ó efna- samsetning þess sé önnur, minnir kornið á nornahár. Það inniheldur t. d. rörlaga gasblöðrur og hefur rifflað ytra borð, eins og þau. — Photomicrograph showing a characteristic grain from the needle-shaped tephra. The composition of the glass is dasitic and thus strongly cont- rasts with the basaltic glass of the Pele’s hair. Nevertheless, it contains pipe vesicles and has grooved surface as the Pe- le’s hair. Ljósm./photo Páll Imsland. Mynd 7. Nornahár úr Kröflu- gosinu í nóvember 1981. Myndin sýnir að í sumum gas- röranna eru vökvabólur. Samsetning vökvans er óþekkt. Örin bendir á gas- bólu, sem vökvabóla hefur lokað af í rörenda. - Photo- micrograph of Pele’s hair from the Krafla eruption of November 1981. The picture shows pipe vesicles with and without liquid bubbles. The arrow points to a gas cavity blocked by a liquid bubble. Ljósm.lphoto Páll Imsland. Mynd 8. Nornahár úr Kröflu- gosinu í nóvember 1981. Örv- arnar benda á vökvabólur, sem innihalda örsmáar agnir af föstu efni. Það virðist vera kristallar, sem fallið hafa út í vökvanum. — Photomicro- graph of a Pele’s hairfrom the Krafla eruption of November 1981. The arrow points at a liquid bubble that contains minute dust-like crystals of unknown composition, that adhere to the glass surface. Ljósm.lphoto Páll Imsland. 140
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