Glass (generic)
  Electronically neutral generic.

Read more about matter and material type in the Chemogenesis web book, particularly these sections:

The Classification of Matter

The Laing Tetrahedron of Bonding & Material Type

Wikipedia Page:

Glass (generic)
is defined with respect to the entities below:
The entities below are defined with respect to:
Glass (generic)
Material type (generic)

Ceramic fiber

Glass fiber

Lead glass

Pyrex® glass

Quartz glass

Rock fiber

Slag fiber

Soda-lime glass

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