Structure and texture of rock formed at low temperatures generally have cracks around it. Therefore, this stone entry into the kategorian fairly soft rock with a hardness between 5.5 to 6.5 mohs. Of the overall weight of opals, 6% to 10% is in the form of water. In contrast to the harsher Bacan stone with a hardness of 7 to 7.5 mohs. With a softer texture that is owned by this stone, then how to treat them any differently with agate / Precious in general.
Kalimaya beauty black opal stone is visible when exposed to light. Black opal will emit a colorful glow awesome. This light is commonly called by the name jarong or Flower. Colorful contained in the black opal stone depending on the region or neighborhood in which the rock was formed. The most common color possessed this stone is white, gray, orange, bright yellow, orange, red, blue, brown, purple, magenta, red rose, green and black.
The black opal is the most widely sought after at the moment is a stone Kalimaya derived from Banten which has a black background with color flowers jarong very colorful contrast. Just like rock Bacan which has its own fans overseas, local stone has been sold to various countries in the world and at a price tag of tens to hundreds of millions of dollars.
In addition jarong flower with red color composition of many other colors are also popular is the opal that emit purple and bright blue. The color of the demand because it is considered beautiful colors but still quite rare found in opals. Currently black opal can be found in various countries in the world that such as India, Egypt, Australia, Mexico and Indonesia.
Black opal Kalimaya quality
- Fiber fine stone and pores are not visible surface section (His
perfect stone has pores that if pemolesannya good then these pores will
be closed perfectly)
- Black opal has two kinds of criteria, there are opaque when illuminated with a flashlight (usually black opal porcelain that is so), and there is also a solid and opaque color flashlight / opaque (generally is still a material).
- As the name implies, stone black opal has a black background with color play a variety of colors. Although the mohs scale of 5.5 to 6.5, but the rock remains solid and not fragile if scratched. In contrast to synthetic stones made of glass / crystal that will easily scratched if exposed to hard objects on the surface.
- Opal Kalimaya nice to have a complete color and issue a lustrous colors (jarong) like a diamond.