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Chinese Name:黑歐泊、黑色蛋白石、黑色澳寶
English Name:Black Opal
Chemical Composition:SiO2‧nH2O
Crystal System:Amorphous
Hardness:5.5–6.5
SG:2.00 - 2.10
RI:1.37 - 1.52
Related Chakra:all chakras especially to root & crown
Birthstone:October
Astrological Sign: Cancer, Libra
Locality:Lightning Ridge, New South Wales, Australia
Colour:Precious Opal with dark colour (N1 - N4 from the body tone scale)
Formation of percious opal:For at least 500 million years of its geological history, Australia was embedded in the ancient southern super-continent of Gondwana. At this time an inland sea covered central Australia, and silica-laden sediment deposited around its shoreline. It's believed that perhaps 30 million years ago, lots of silica was released into a solution which filled cracks in the rocks, layers in clay, and even some fossils. Some of them became precious opals.
Growth time for percious opal: It takes about 5 to 6 million years to make a 1 cm opal to mature.
Special Optical Effect:Iridescent Effect, or rainbow effect. It's an optical effect exhibit by some gems, in which it shows rainbow colours under white light, the colour will changed when the stone rotate. In precious opal, this rainbow effect is cause by the arrangement of the silica sphere. with the diameter size around 150 to 400 nm and tidy arrangement, that causes diffraction of white light and interference, thus create the rainbow colours. Not every type of opal will show iridescence, for those exhibit this rainbow effect is "precious opal".

Body Tone
Scale:
Body tone, body of tone, background colour, colour background, body colour or body background all refer to the relative darkness or lightness of the opal, while ignoring its play of colour. This is assessed on a Scale of Body Tone (from N1 to N9)
To use the body tone scale place opal on the scale and slide to match the body tone.
Brightness
Scale:

To use the brightness scale place opal on the scale and slide to match the brightness.
Functions:
1. Wear as a talisman.
2. It's a lucky stone.
3. It eases distress and dissolves depression and hopelessness.
4. A very good grounding stone.
5. Reduces anxiety and depression. Black opal helps you accept and overcome difficult situations.
   
General care:
 
1. Avoid contact with perfumes, hair spay, make-up.
2. Gem can be scratched easily, so wear with caution.
3. Avoid knocks.
4 Avoid direct sunlight for a long period of time.
5. Avoid heat.
6. Do not soak in jewellery cleaner.
7. Avoid contact with household cleaners.
8. Avoid using ultrasonic and steam cleaners.
9. Storage: Avoid dry / hot storage conditions.
10. Cleaning: Clean by wiping with a damp or dry cloth only.
 
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Iridescent Effect of
Black Precious Opal
Opal Species Locality Details Colour

Precious Opal
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Australia, Ethiopia Opal with play-of colour on a pale (white opal) or dark (black Opal) background.
Functions:
1. It enhances cosmic consciousness and induces psychic and mystical visions.
2. Opal stimulates originality and dynamic creativity
3. Wearing opal is said to bring loyalty, faithfulness and spontaneity to you.
4. Sales people wear opal can bring out his/her charm, attract customers & clients.
5. Place a piece of rough opal inside the cashier at work place, it helps to accumulate wealth.
White to Dark.
Any colour

Fire Opal
hot sell
Mexico,
USA
Transparent to translucent brownish-yellow, to orange to reddish-orange; may show a play-of colour.
Functions:
1. Fire Opals utilize the elemental energy of Fire to awaken one's passion, from bodily desires to spiritual ecstasy.
2. Can be used to stimulate change, manifest your ideas.
3. Ideal stones for business endeavors, Fire Opals draw in money, facilitate change, and usher in progress.
4. It may be used to release deep-seated feelings of grief.
5. Wear to become more optimistic, socially outgoing and confident.
Yellow, Orange, Red, Brown
Common Opal
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Africa, Brazil, Peru,
USA,
Ethiopia

Translucent to opaque material with a range of body colours but no play-of-colour.
Functions:
1. Common Opals are magnificent for metaphysical purposes, vibrating at a lower frequency than other Opals, and provide gentle, nurturing support for the emotional body.
2. They help alleviate worry, chronic stress and depression
3. Common Opals are perfect antidotes for sleeplessness and nightmares, and healing subconsciously held pain.
4. Common Opal combines Earth and Water energies, and may be used to balance the male/female energies within the body, and to both align and balance the chakras.
5. Common Opal facilitates attunement with the higher self and the ethereal realm, bringing a calm, centered mind for prayer and meditation.
Pink, Green, Blue and White

Boulder Opal
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Queensland, (Australia) It is naturally attached to the host rock in which it was formed. It consists of rock containing seams of precious opal that are too thin to cut without retaining a backing of the brownish matrix.
Functions:
1. Wear as a talisman.
2. Boulder Opals carry not only warm Earth energies, but also the illuminating energy of Fire.
3. They assist practical people in developing their spiritual sides, and help spiritually minded people succeed in the everyday world.
4. Boulder Opals are great for reconciling conscious and unconscious thought, bringing clarity and emotional security
Dark Brown to Black
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