Opals : the chemical composition SiO2.nH2O impurities with a variety of colorful many colors, is characterized as amorphous turns on automatically with the passage of time to Calcedona and then to quartz, hardness 5.5 to 5.6, the specific weight of 9.1 to 3.2, color milky white or varied depending on the impurities entering in combination. Jawahrh of months:
- Alheidrofan hydrophane a glassy If Java was apparently transparent when submerged in water.
- Alheialit hiallite a colorless transparent as glass.
- Opal authentic original opal milky white, the bad type is the fire stone flint. 10. chalcedony chalcedony: the chemical composition SiO2 with a lot of impurities, which earn a variety of colors, made up of some beautiful gems, crystals, fibrous very precise turn with time to quartz. Strongly cohesive, compact, impermeable, smooth surface, cruelty 6-7, resistant to acids and external influences. Of the most valuable types: Saavirin (blue color), Krizoberaz (green), jade, jade or jasper (a color olive-brown or red), Agate agate (or Yamani stone), and is characterized by the structure of the zonal annular centralized irregular varying colors and beautiful, onyx onyx (onyx) and is characterized by its predecessor that subdomains color widescreen. The cheap types of dishes are very Calcedona and take the white or black or brown colors and called Balsoan.
- Alheidrofan hydrophane a glassy If Java was apparently transparent when submerged in water.
- Alheialit hiallite a colorless transparent as glass.
- Opal authentic original opal milky white, the bad type is the fire stone flint. 10. chalcedony chalcedony: the chemical composition SiO2 with a lot of impurities, which earn a variety of colors, made up of some beautiful gems, crystals, fibrous very precise turn with time to quartz. Strongly cohesive, compact, impermeable, smooth surface, cruelty 6-7, resistant to acids and external influences. Of the most valuable types: Saavirin (blue color), Krizoberaz (green), jade, jade or jasper (a color olive-brown or red), Agate agate (or Yamani stone), and is characterized by the structure of the zonal annular centralized irregular varying colors and beautiful, onyx onyx (onyx) and is characterized by its predecessor that subdomains color widescreen. The cheap types of dishes are very Calcedona and take the white or black or brown colors and called Balsoan.
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