There are very few places on Earth you can find pure Sand. In most instances, impurities in the Sand give it an off-white or beige color.
Pure, white Sand can easily be made in the home laboratory.

Chemicals Required:
Sodium Silicate
Sodium Bisulfate

Procedure:
1. Measure 5 mL of Sodium Silicate solution and pour it into a test tube. To this, add 5 mL of water. Shake until the solution is completely dissolved.

2. In a second test tube, dissolve 3.5 grams of Sodium Bisulfate in 10 mL of water. Stir vigorously with a glass rod until it is completely dissolved.

3. Pour the contents of the first test tube into the second. Mix thoroughly. A thick, jelly-like precipitate will be form in a few minutes. This substance is known as Orthosilicic Acid

4. Spoon some of the Orthosilicic Acid into a porcelain crucible. Heat the Orthosilicic Acid over a butane or Bunsen burner or 5 minutes.

5. When the mixture is thoroughly dried, it will be reduced to a white solid. This substance is known as Silicon Dioxide, or pure Sand.