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Basic unit of silicate structure

Left: SiO sub 4 tetrahedra. Basic unit of all silicate structure. Right: Si sub 2 O sub 7 (double Tetrahedral group). In silicate structures the silicon atoms group in fourfold symmetry with oxygen. The basic unit of all silicate structure is the tetrahedron. The sorosilicates possess double tetrehedral groups.

Beach sand and gravel

Beach sand and gravel. Note sorting, stratification. Arden Ridge near Neepawa, Lake Agassiz beach. April, 1962.

Beach sand and gravel

Beach sand and gravel, close up to show sorting, stratification. Arden Ridge near Neepawa, Lake Agassiz beach. April, 1962.

Beaded drainage

Beaded drainage, (Multiple ponding) in muskeg. Location: Anderson River area at 69 degrees 10' N. lat. and 129 degrees 00' W. long, Air photo A12702-226.

Results 166 to 180 of 1973