How agate is formed Wondering how those colored striking bands that sometimes even resemble the dendrites of a tree, are formed?
Agate’s chemical composition is Silicon Dioxide, SIO2. It is a fossil stone and is formed when gas bubbles trapped in solidifying lava are filled with alkali and silica water. These bubbles and the silica congeal into a gel. The alkali attacks the iron in the surrounding lava, resulting in the loss of water. Bands of iron hydroxide are formed in the gel. The gel, losing water crystallizes. When cut in cross sections an agate can reveal some spectacular forms. Polishing Agate Video Types of agate The peculiarities and the dissimilarities in the shape and color of these bands characterize the varieties of agate. Onyx, a magnificent, magical quartz with black, brown or red stripes on white is also an agate. It is called a Riband Agate. A Ring Agate has concentric bands of different colors giving the appearance of an eye[s] when seen. The Moss Agate is another fascinating form formed by filaments of a green color embedded in the agate. This often looks like a vegetal growth and hence known
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