1.   It is located in a chamber that Greathouse dug out to extract the silica sand, and, for being underground, the room is quite spacious.

2.   The most common aggregate is silica sand.

3.   The silica sand was used to make glass, most popular for canning jars, ketchup bottles and drinking glasses.

4.   Those blades are planted in artificial dirt, made up of ground-up crumbs of old tires, tennis shoes and silica sand.

5.   Silica sand is used to make glass.

6.   These products made from silica sand imported from Holland but crafted by local glass blowers will have the engravings of both the manufacturer and Harrods.