Growth Forms of Large Frost Crystals in the Antarctic

A variety of frost-crystal forms found growing from the vapor in ice caves and tunnels in the Antarctic are described and illustrated . Complex la yered structures found within large, skeletal cr ystals are ascribed to the action of the temperature gradient. Some novel c-axis growth forms and a rare type of bicr ys tal growth accelerated growth in a particular direction along a particular grain boundary are also shown . RESUME. Formes de croissallce des grands cris/aux de givre ell AIl/arc/ide. Description de differentes formes de cristaux de givre rencontres dans des grottes et tunnels antarctiques . Les structures litees complexes que montrent les grands cristaux squelettiques sont attribuees a l'effet d'un gradient de temperature. On decrit egalement des formes de croissances origin ales par rapport a l'axe