In its pure form glass is a transparent, strong, hard-wearing, essentially inert, and biologically inactive material that can be formed with very smooth and impervious surfaces. Glass is, however, brittle and will break into sharp shards. These properties can be modified or changed with the addition of other compounds or heat treatment.
Common glass contains about 70% amorphous silicon dioxide (SiO2), which is the same chemical compound found in quartz and in its polycrystalline form, sand.
More on [ Glass ]

Brien Engel - Biography, recordings, and a curriculum guide for school performances by the glass harpist.
Meta Description: [ Brien Engel's Glass Harp website ]
Glass Music - Musician Lynn Drye's information on history, the glass armonica, musical bowls, glass harp, glass xylophone, as well as her profile, performances, and recordings.
Meta Description: [ Discover the fascinating world of Glass Music! Lynn Drye is one of the few musicians in the world who performs on the Glass Harmonica. Her other instruments include Glass Harp, Glass Xylophone, and Musical Bowls. Find out more... ]
Glass Music - Profiles of Martin Hilmer and Beate Fürbache, their performance programs, historical development of glass music, and descriptions and photographs of musical glasses, the euphone, and the verrophone. [English/German/Japanese]
Meta Description: [ Glas und Harfe, bezaubernde Musik mit Glasinstrumenten und Konzertharfe bieten Ihnen Martin Hilmer (Verrophon, Gläserspiel und Euphon) und Beate Fürbacher (Harfe). Klassische Werke, Originalwerke für Glas und Bearbeitungen, Evergreens und Arrangements für Konzert, Feste und Feiern. Glass and harp... ]
Peter Bennett - Concert glass harpist and street entertainer. Includes biography, performance schedule, sound clips, CD ordering, and a lesson plan for teachers.
Meta Description: [ Concert glass harpist and street entertainer Peter Bennett travels the world introducing audiences to the history, lore, and physics of glass music. Peter is also an award-winning pursed-lip whistler and has rcently built a hurdy-gurdy to use in street performance when conditions might endanger ... ]
Psyche Van Het Folk: Glass Instruments - Explanations, by Thomas Bloch, of the differences between the seraphim, glass harp, verillon, glass armonica, and glass harmonica.
The Chrysler Museum of Art: Grand Harmonicon - Photograph and history of the instrument developed and manufactured by Francis H. Smith in the early 1800s. Includes a score, resources, and brief discography.
The World of Glass Music - Profile of glass musician Clemens Hofinger, reviews, upcoming performances, and audio samples. Also includes history, photographs and descriptions of the armonica, glass harp, and verrophone. [English/German]
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