Aquamarine Structure
(396 views)Aquamarine is beryl, beryllium-aluminum-silicate mineral. When it grows unimpeded, it forms hexagonal prism. in its simplest form, its chemeical formula is (Be3Al2Si6O18), and it is clear or white in colour. Aquamarine, in addition of Fe, it gives the gemstone precious blue color. The amount of valence of the element oand site of its occupancy read more
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Snake skin permeability
(408 views)Permeable skin is what allows amphibians to live in Petrified Forest. Amphibians do not drink; instead, they absorb water through their skins. Most terrestrial amphibians have an area of skin called the pelvic patch. This thin patch has a network of capillaries that absorb moisture from the environment. Spadefoot toads, residents of the park, absorb water from the soil in which they hibernate. Although permeable skin allows for water absorption, it provides little barrier to evaporation. This causes amphibians’ water balance to be in constant flux. Evaporative water loss also results in loss of body temperature. This is why you often see amphibians on warm pavement in the evening. It is not an easy life for amphibians in this dry grassland. Behavioral and physiological mechanisms that shape their daily life make it possible for them to survive. read more
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Ice II: space packing
(155 views)Ice II
Ice II is rhombohedral. It has similarities, not surprisingly, to Ice I in that it consists of undulating six-membered rings joined to another ring below it. However, neighboring rings do not form a complete hexagonal network but instead surround threefold screw axes. read more
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Ice III: space packing
(170 views)Ice III
Ice III is tetragonal. The unit cell is cubic in dimensions (6.83 Angstrom units on a side) but tetragonal in symmetry. The density is 1.14 gm/cc. The tetrahedral O-H-O links are somewhat distorted. In the diagram below, oxygen atoms are shown in blue with larger atoms closer to the viewer. O-H-O links are in red, with thicker lines closer to the viewer. read more
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