Hyalite
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Hyalite is a form of opal with a glassy and clear appearance which exhibits an internal play of colors and has natural inclusions. It is also called Muller's glass, water opal and jalite. Its Mohs hardness is 5.5 to 6 and it has a specific gravity of 2.1. It is an amorphous form of silica. Its has a conchoidal fracture, a vitreous luster and a white streak. It is sometimes mistaken for resin opal, since they both look like little globs. It glows under blacklight bright green. Discovered in 1950s. Hayalite is a description of a "jelly" type of opal where it is extremely transparent and like in suspended animation where other opal has some "opaqueness". It is si o4 silicon dioxide and water , water is an important part of opal as only in recent times it was discovered what makes the colour in precious opal , that islight passing thru microsopic voids between water molecules.
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