Australian Black Opal Stone – Birth of Black Opal
The birth of Australian Black Opal Stone began around 600 to 500 million years ago when the suturing of the ancient continent Gondwana evolved.
Gondwana was an incredibly massive continent incorporating many land masses that are now part of our Southern Hemisphere. Lands forming this ancient continent included the Indian subcontinent, the Arabian Peninsula, South America, Africa, Madagascar, Antartica, and Australia.
In the ancient times of Gondwana, an inland sea producing significant amounts of silica-laden sediment covered the central part of today’s Australian continent. The presence of this inland sea provides the seed for the birth of Opal by depositing vast quantities of Silica into small cracks in rocks (voids), decomposed fossils, and in layers of clay. In summary, Black Opal is the result of water flowing down through the earth and picking up silica from sandstone on the way. The water evaporates and the silica-rich deposits are left behind creating a path for the birth of opal.
Silica naturally nourishes our marine environment and the many marine fossils, fish bones, and shells found in central Australia confirm the existence of this Silica bearing inland sea.
Australian Black Opal Stone – The Legend
Sanskrit is an ancient language in Hinduism, and there is the belief that the English word Opal, evolves from the Sanskrit word upala, meaning ‘valuable or precious stone.’
The name Opal may also be associated with the Greek word opallios, meaning ‘to see a change in colour’. The ancient Greeks also believed Opals (opallios) to be the ‘Tears of Zeus.’
The ancient Australian Aborigines believed the opal to be half serpent and half devil. The beauty of the fire colours within the stone would lure and trick someone to enter the demon’s den.
Today, the Aboriginal legend tells the birth of opal happening when the footprint of the creator touched the earth at the base of a rainbow to bring harmony.
Australian Black Opal Stone – Lightning Ridge
Black Opal stone is native to Australia. It is unique and rare. And you can only find this precious gemstone in the Opal fields in and around Lightning Ridge (LR) NSW, Australia.
Located approximately 730 km north-west of Sydney and 730 km south-west of Brisbane, Lightning Ridge has no traffic lights and is the Black Opal Capital of the World.
Australian Black Opal Stone – What is Black Opal?
The Australian Black Opal Stone is a non-crystalline natural gemstone that most often changes colour when rotated at different angles.
This rare and unique gemstone is a formation from the combination of silicon dioxide (silica & oxygen) with water, and ideally between 3 to 10 % moisture content by weight. Quality solid Black Opal Stone contains approximately 5-6% water.
It is estimated to take between 5 -6 million years for a 1 cm thick silica vein to form.
For more information please click this link What is Black Opal.
Australian Black Opal Stone – Seams & Nobbies
The Australian Black Opal is a highly valued gemstone. In fact, so valuable that at times attracts a price of up to Aud $20,000 a carat.
Black Opal Stone exists in claystone layers at depths between 20 to 60 feet below the ground surface of the Griman Creek Formation and the greyish claystone (opal dirt) lies below overlying sandstone and conglomerate rock.
Black Opal forms in horizontal deposits referred to as seams and also forms in rounded nodules of potch and colour called ‘nobbies.’
Mining Black Opal is hard yakka and the best time to mine opal is in the colder months due to the hot extreme conditions during summer.
And in the earlier days, picks and shovels were the only tools available to remove the rock as illustrated.
Australian Black Opal Stone – Cabochon
Identifying loose Solid Black Opal is easy because there are no layers. However, imitation Black Opal Stone set in jewelry can be harder to recognize and by Australian law, must be labeled as imitations. The most common known fakes are Gilson Opals, Doublets, and Triplets. Price should also be a guide in determining whether the opal is a solid black opal or an imitation!!!
ALL Opals & Jewels Australian Solid Black Opals DO NOT have any material(s) adhered to their structure and are unaltered natural pieces of art more scarce than diamonds.
We DO NOT sell doublets, triplets or synthetic Opal. ALL our Opals are solid Australian Black Opal Stone.
Australian Black Opal Stone – Opal Facts
- Australia produces approximately 95% of the World’s Opal
- South Australia provides about 80% in the form of White Opal
- Queensland and NSW share the remaining 15%
- Queensland is known for Boulder Opal
- The NSW town of White Cliffs is famous for the Pineapple and White Opals
- The NSW town of Lightning Ridge is World renowned for the rare Black Opal
Australian Black Opal Stone – Australian Opal Guide
There are rogue dealers in any industry, and the jewelry industry is no exception. There are those that will falsely advertise fakes as the real deal. So if a merchant presents you with an opal, set in jewelry for under $30, the chances are it’s an imitation.
What to look out for:
- The Country of Origin – 95% of the world’s opals come from Australia
- Price – The rare Australian Black Opal is not cheap, and can attract a price of up to Aud $20,000 per carat
- Patterns – laboratory made stones have snake-like orderly patterns.
- Colours – large bright patches indicate an artificial opal.
- The Depth of Colour – Colour just beneath the surface indicates a fake, depth of colour indicates a real opal (view under white light only).
- Layers – check the sides to see if there are any layers.
- Cloudy Stone – If you see a cloudy stone then it is most likely a Doublet or a Triplet (water penetrating through an adhered layer).
It would be terrific to hear your thoughts on Black Opal, and if you have any questions, please feel free to ask.
We have a stunning collection of beautiful solid Black Opal stone pendants and necklaces for you to choose from.
By the way, if you like opal what is your favourite colour(s).