About my Black hole dream.
The skull had a white-bit-of-grean-tinged opal between the temple and the forehead, on it's left side.
I'm Googling South Australian Opal to learn what my Black Holedream meant.
Opal is one of the world's most beautiful and precious gemstones, predominantly found in Australia. It is one of only six types of precious gemstones found on planet earth, sharing prestigious company with
diamonds,
rubies,
sapphires,
emeralds, and
pearls.
Over 95% of the world's precious opal comes from Australia, and opal is Australia's national gemstone.
Wow! I did not know that!
(...) Precious opals exhibit the characteristic play-of-colour, and is comparatively rare. Opal which is dull and valueless is called common opal. Common opal occurs in abundance throughout the world.
(...)
Scientifically, opal is known as SiO2·nH2O - an amorphous mineraloid comprised of hydrated silicon dioxide. (A mix of silica and water). The opal's appearance can range from colourless, white, and light grey through to dark grey and black. However the truly unique thing about opal is that it displays all the colours of the spectrum in a "play of colour", resulting from the interference and diffraction of light passing through tiny silica spheres in the microstructure of opal. This means the bright rainbow colours of opal, as they appear to the human eye, will move and change dramatically depending on the angle at which the stone is viewed
Australian opal is referred to as "sedimentary opal" because it is hosted predominantly by sedimentary rocks of the Mesozoic Great Artesian Basin. Australian precious opals usually contain around 5-6% water and consists of small silica spheres arranged in a regular pattern. Its hardness of 5.5 to 6.5 on Moh's scale puts it about half way down the range (roughly the same hardness as glass). It has a specific gravity of 1.9 to 2.3 depending on the amount of water present.
HOW IS OPAL FORMED? **
Opal is formed from a solution of silicon dioxide and water. As water seeps through sandstone, it picks up tiny particles of silica. Millions of years ago, the solution flowed into cracks and voids in sedimentary as well as volcanic areas inland Australia. Estimates suggest this solution had a rate of deposition of approximately one centimetre thickness every five million years at a depth of forty metres. Over a period of approximately 1 to 2 million years after this period solidification occurred as the climate changed. The opal therefore remained soft and un-cemented for long periods before becoming hardened.*
[quote] WHY AND HOW IS OPAL COLOURED? **
As the silica in solution was deposited, and the water content gradually decreased, spheres formed in the gel. The spheres are formed by the particles of silica spontaneously adhering to other particles which form around it. These spheres of amorphous silica range in size from 1500 to 3500 angstroms (1 angstrom is 1 ten millionth of 1 millimetre).
The spheres are not only remarkably uniform in size but are packed, in gem quality opal, in a very regular array. Because they are spherical, there are tiny holes remaining in the structure (much the same as when marbles are placed together in a container) and these holes too are arranged in a regular three dimensional way. Therefore because of the regular array of these cavities, opal is an optical diffraction grating for visible light. **
When the spheres are bigger (about 3500 angstroms diameter) the red or orange colours are produced. And at the other end of the scale, at about 1500 angstroms diameter, the blue end of the spectrum is diffracted. Between these figures the rest of the colours of the rainbow occur. *From this it can be deduced that the light diffraction in the voids is greatest when the sphere size is greatest. Therefore red is usually the brightest colour and the blue duller.*
In summary, the colour in precious opal is caused by the regular array of silica spheres and voids diffracting white light, and breaking it into the colours of the spectrum. The diameter and spacing of the spheres controls the colour range of an opal. Small spheres produce opal of blue colour only (the most common), whereas larger spheres produce red (the rarest colour).
The Opal in my future skull was medium-to-light green
From here:
What is opal? | Opals Down Under
HA! Found it, this is Exactly what it looked like
Forum code:*
Crystal Opal
Transparent or translucent opal is defined as crystal and here the colors are sharp and visible below the surface. Crystal opals come in all color variations and display bright colors. Crystal opals can be either light or dark and are solid.
Crystal opal is clear enough to see through against a light surface but when viewed on a dark surface the colours really spring to life. In terms of value, the more transparent the stone is, the more it is worth. See our*Crystal Opal*page for more detail.
It is the 3rd Opal on this page
Australian Opal Guide - Formation, Valuing & Care
Maybe the skull in the dream represents the skull I am in now. Maybe the Opalizing is beginning Now.
More later ... the battery on this tablet needs changing ... so ... back in 2 or 3 hours.
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