### glass:

Art glass
* includes perfume bottles, vases, lamps and goblets.
* is glass
  - ornaments
  - work of art
* sinks The colors, styles and shapes of handblown art glass sinks vary widely.

Bioactive glass
* is such a material.
* promotes bone formation and forms a direct bond with bone when implanted.

### glass:

Broken glass
* can cause cuts and fireworks that are still hot can cause burns
  - easily puncture bicycle tires
  - result in injury to staff or broken equipment
  - shred feet, especially children's
* contains sharp edges and can be quite painful if jabbed into any part of the body.
* handling hazard for the recycling truck operator.
* is another major hazard to children
  - diposed of in special disposable cardboard containers
* is located in beachs
  - bridges
  - fields
  - streets
  - trash
  - sharps
  - the most common accident to occur in science labs

Cataract glass
* affect vision differently than regular eyeglasses.
* are heavier, thicker and more bulky appearing than ordinary glasses.

Colored glass
* is crushed into different grain sizes called 'frits'
* permit dyslectics to read normally.

Fiber glass
* contains no chemicals that can corrode pipes and wiring.
* has many of the same characteristics as asbestos.
* is very sensitive.

Green glass
* can pass as an emerald.
* transmits light.

Hot glass
* has some of the same characteristics as honey.
* is the art of glass as practiced by glass blowers working at the furnace.
* looks exactly the same as room temperature glass.

Laminated glass
* can crack and separate.
* has better resistance to fallout, as does film coated glass.
* is fabricated with a thin layer of plastic embedded near the center of the glass
* is more complicated due to the thickness of the interlayer
  - expensive than either float or tempered glass
  - shatterproof and is used as a safety glass
  - used to resist storm damage, break-ins, bombings, and fire

Leaded glass
* has an increased refractive index, which makes it appear to be more brilliant.
* makes it possible to watch television and use computers safely.

Metallic glass
* are of fundamental as well as technical interest.
* differ from conventional metals in that they lack crystalline structure.

Molten glass
* is extremely viscous and approaches infinite viscosity as it solidifies
  - fed into a steel mould which rotates at the required speed
* is forced into molds at high temperatures and pressed to create optical lenses
  - through a kind of sieve, thus spinning it into threads
  - shaped by pouring hot glass into a mold
  - used as the working medium

Natural glass
* are amorphous with rounded shapes and they usually contain conchoidal fractures.
* is formed naturally without the intervention of man.

Opalescent glass
* allows just the right amount of light through to highlight the black musical note.
* can exclude light.
* is translucent and white with a greyish or bluish tint.
* thick, rolled glass in which the colors are streaked and marbled.

### glass | optical glass:

Flint glass
* contain lead.
* is optical glass

### glass | quartz:

Beta quartz
* has higher symmetry, is less dense and has a slightly lower specific gravity.
* is hexagonal, but it inverts on cooling to alpha-quartz, which is trigonal.

Carnelian
* Most carnelian comes from Brazil and Uruguay, and India.
* is quartz