The most important thing to learn about the OSI model is what it really represents. Pretend you're an operating system on a network. Your network card, operating at layers 1 and 2, will notify you when there's data available. The driver handles the shedding of the layer 2 frame, which reveals a bright, shiny layer 3 packet inside (hopefully).
Used with permission. Agate is a variety of chalcedony, a cryptocrystalline form of quartz. Translucency, patterns of color, or moss-like inclusions may distinguish this stone from other forms of chalcedony. Agates can show a wide variety of vivid, multiple colors.
Chalcedony is found in all types of colors, and its varieties are named based on color. The variety Agate is a multicolored form, well known for its distinctive banding patterns.Some forms of Chalcedony, such as Chrysoprase, are intensely colored, while others are light. Chrysoprase-Apple green variety of Chalcedony. 2  Fire Agate-Form of Agate or Chalcedony that is iridescent with a play of colors or fire similar to that of Opal. 3  Fire Agates usually have botryoidal growth included in their interior. 4  The play of color is caused by inclusions of Goethite or Limonite.