Recognize the session layer of the OSI model ; List the seven layers of the OSI model ; Discuss the responsibilities, functions and protocols of the session layer ; Specify the six session layer protocols
Currently, the most popular color for this gem is the blue zircon. Most blue zircon, which is considered an alternate birthstone for December, is normally a pastel to medium blue in color, but some exceptional gems have a bright blue color. Beyond blue, Zircon is also available in green, deep red, yellow, brown, and orange.
Naturally occurring zirconium is a mixture of five isotopes and they are found in the percentages shown: 90 Zr (51.5%), 91 Zr (11.2%), 92 Zr (17.1%), 94 Zr (17.4%) and 96 Zr (2.8%). The most naturally abundant is 90 Zr at 51.5%.irconium was first recognized as an element by Martin Heinrich Klaproth in 1789, in Berlin, in a sample of zircon (zirconium silicate) from Sri Lanka. His analysis of the mineralâs composition showed: 25% silica; 0.5% iron oxide; 70% new oxide.