### glass | quartz:

Topaz
* Some topaz is colorless.
* are birds
  - precious stones
* occurs in many colors, including orange, red, pink, beige, and green.
* prevents procrastination and relieves the common cold.

### glass | quartz | topaz:

Blue topaz
* Some blue topaz are indistinguishable from aquamarine with the naked eye.
* is rare in nature, but easily created from clear material.

Pure topaz
* is colorless and transparent but they usually have colors.
+ Topaz, Color and varieties: Gemstones :: Birthstones
  * Pure topaz is colorless and transparent but they usually have colors. The typical topaz is wine, yellow, pale gray, reddish-orange, or blue brown.

Recycled glass
* Most recycled glass comes from glass containers for food, beverages and cosmetics.
* is made of cullet, or crushed glass.
* uses only two thirds the amount of energy needed to make new glass
  - two-thirds the energy needed to manufacture glass from scratch

### glass:

Safety glass
* Make sure the surface to be carpeted is smooth and clean.
* Many safety glasses have side shields molded into or attached onto the earpieces.
* Most safety glasses protect against particles coming from in front of the face.
* are the minimum eye protection required for all laboratory work.
* are to be worn at all times in the laboratory
  - times while a lab experiment is in progress
  - in laboratories at all times
* come in a variety of lens materials, shades and tints.
* ensure any splinters are deflected away from the eyes.
* is glass
  - made by sandwiching glass between layers of plastic
  - safety devices
* protect the eyes.

Sodium silicate
* are available in either granular or aqueous solution forms
  - chemical compounds
* is corrosive and can cause severe eye irritation and corneal burns
  - the most commonly used structural grout for clean, sandy soils

### glass:

Stained glass
* can bring beauty, joy and inspiration into one's life
  - transform ordinary spaces
* craft anyone can do.
* distinctive medium for art.
* is an art form for an illiterate society
  - that dates back a thousand years to pre-medieval Europe
  - applied to inside of sheets of salvaged car window glass with clear silicon caulk
  - both an ancient fine art and a craft
  - graphics
  - located in churchs
  - ornaments
  - produced by solu- the American contribution to the industry
  - the art of manipulating coloured light within an architectural context
  - used in some kinds of art
* major form of the decorative arts that has an intimate link with architecture.
* remains a growing trend in quilting.
  * is used in some kinds of art. It is much used in Christian art but other themes are not rare.

### glass:

Tektite
* Some tektites are teardrop shape, indicating that they have been moulded by aerodynamic forces.
* are a special type of glassy meteorite
  - impactite which show characteristics produced by flight
  - bits of colored glass, formed from melted quartz minerals, heated by impact
  - flash frozen bits of ejecta produced by meteorite impacts
  - larger glass beads with unusual shapes and surface textures
  - protective in nature and aid one in grounding into Earth reality
  - rocks that have been melted to glass by the severe heat of an impact
  - smooth glass-like stones that are found in certain sedimentary layers on earth
  - strange glassy objects scattered over the earth's surface at various locations
  - terrestrial
  - usually translucent, and occur in a range of colors from green to brown
* occur in broad bands in specific localities in different parts of the world.
* usually have a heavily pitted surface.

Tempered glass
* breaks into small pieces, rather than large shards, if damaged.
* is four times stronger than regular glass
  - heated and then cooled rapidly
  - is used on the side windows of automobiles