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Sunflower seeds contain silica dioxide

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One allotrope is in the form of shiny, grayish-black, needle-like crystals, or flat plates. The second allotrope has no crystal structure and usually occurs as a brown powder

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One allotrope is in the form of shiny, grayish-black, needle-like crystals, or flat plates. The second allotrope has no crystal structure and usually occurs as a brown powder

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Silica is very hard. It has a very high melting point at 1,610 degrees Celsius. Its boiling point is 2,230 degrees Celsius. Silica is insoluble in water, and does not conduct electricity. These properties result from the very strong covalent bonds that hold the silicon and oxygen atoms in the giant covalent structure.

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Silica , also known as silicon dioxide is a compound of two of the Earth's most abundant elements; silicon and oxygen. Silicon belongs in group 14 which is known as the Carbon Family. Silica's atomic number is 14.