Xenoblastic refers to metamorphic mineral with poorly formed crystal faces (equivalent to anhedral). Foliation is a general term for pervasive planar structures. Typically the result of fine-scale compositional layering and alignment of minerals.
1 Snowy owls live farther north than any other kind of owl in North America! 2  Fine Feathers! 3  A dense coat of feathers keeps a snowy owl warm during frigid winters. 4  Even the owlâs toes and claws are thickly feathered! 5  Early Risers. 6  Most owls sleep during the day and are active at night.
Snowy owls and eagle owls also occur but an encounter with these is much less likely. Tawny owl. Tawny owls are Britainâs most familiar due to their widespread distribution. They are associated with deciduous woodland and nest in tree cavities and old buildings. In woodland, bank voles, wood mice and shrews are common in their diet.