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SiO2 - Mohs Hardness: 7. Silicon is a common element but rarely occurs as a free element. It is widely distributed as dusts and sands in various forms of silicon dioxide (silica). Silica is the primary component of all types of standard and specialty glass. In its pulverized form, ground silica is used in the production of fiberglass insulation and reinforcing glass fibers. Glass is produced by melting silica at high very high temperatures along with a mixture of soda ash, lime from limestone, and feldspar. Other materials are added to change properties and to produce colors.

Document Type


File Type


Geographical Area

New Jersey


The University of Toledo

Digital Publisher

Digital Initiatives, University of Toledo Libraries

LC Subject

environmental sciences; virtual exhibitions

Source Collection

UT Department of Environmental Sciences


virtual exhibition; science;


Image Location


Rights Statement

Rights Statement

No Copyright - United States. URI:
The organization that has made the Item available believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries. Please refer to the organization that has made the Item available for more information.