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Occasionally, when conditions are ideal, spheres of silica, contained in silica-rich solutions in the earth form and settle under gravity in a void to form layers of silica spheres. The solution is believed to have a rate of deposition of approximately one centimetre thickness in five million years at a depth of forty metres. If the process allows spheres to reach uniform size, then precious opal commences to form. For precious opal the sphere size ranges from approximately 150 to 400 nanometres producing a play of colour by diffraction in the visible light range of 400 to 700 nanometres.

Each local opal field or occurrence must have contained voids or porosity of some sort to provide a site for opal deposition. In volcanic rocks and adjacent environments the opal appears to fill only vughs and cracks whereas in sedimentary rocks there are a variety of voids created by the weathering process. Leaching of carbonate from boulders, nodules, many different fossils, along with the existing cracks, open centres of ironstone nodules and horizontal seams provide a myriad of moulds ready for the deposition of secondary minerals such as opal.

Much of the opal deposition is not precious. It is called “potch” by the miners, or common opal by the mineralogist, as it does not show a play of colour. Opaline silica not only fills the larger voids mentioned but also may fill the pore space in silt and sand size sediments cementing the grains together forming unique deposits, known as matrix, opalised sandstone or “concrete” which is a more conglomeratic unit near the base of early Cretaceous sediments.

The many variations in the types of opal depends on a number of factors. In particular, the climate provides alternating wet and dry periods, creating a rising or more importantly a falling water table which concentrates any silica in solution. The silica itself is formed either by volcanic origin or by deep weathering of Cretaceous clay sediments producing both silica and white kaolin often seen associated with the Australian opal fields. Special conditions must also prevail to slow down a falling water table in order to provide the unique situation for the production of its own variety of opal.

The chemical conditions responsible for producing opal are still being researched, however some maintain that there must be acidic conditions at some stage during the process to form silica spheres, possibly created by microbes.

While volcanic-hosted and other types of precious opal are found in Australia, virtually all economic production comes from sediment-hosted deposits associated with the Great Australian Basin. Australia has three major varieties of natural sediment-hosted precious opal – black opals from Lightning Ridge in New South Wales, white opals from South Australia, and Queensland boulder and matrix opal.
system
ise phir se likhen taaki ek baccha ise samaj sake

kabhi-kabhi, jab sthitiyaan adarsh hoti hai, to silica ke gole, prithvi ke rup main silica-samrudh samaadhaanon main nihit hote hai or silica gole kii paraton ko banane ke liye ek shunya main gurutvkarshan ke neeche bas jate hai.mana jaataa he ki samaadhaan ke paas chalis meter kii gaharaai par paanch million varshon main lagbhag ek centimetre motaai ke bayaan kii dar he.yadi prakriya kshetron ko samaan aakaar tak pahunchane kii anumati detii he, to keemtee opel banane ke liye shuru hota he.keemtee opel ke liye kshetra kaa aakaar lagbhag 150 se 400 nanometer tak hota he, jo 400 se 700 nanometer kii drishy prakaash seemaa main vivartan dwaara rang kaa ek naatak paidaa karata he.

prayek sthaneey opel kshetra yaa ghatana main opel bayaan ke liye ek site pradaan karne ke liye kisi prakaar ke voids yaa porosity hona chahie.jwalamukhi chattaanon or aas -paas ke vaataavaran main opel keval vughs or daraaren bharne ke liye prakat hota he jabaki talchhati chattaanon main apkshay prakriya dwaara banaai gai vibhinn prakaar ke voids hote hai.boulder, nodeul, kai alag -alag jeevashmon se carbonate kii leaching, maujuuda daraaren ke saath, yranstone nodeules or kshaitij seem ke khule centre opel jaise dwitiyak khanijon ke jamaav ke liye taiyaar molds kaa asankhya pradaan karte hai.

opel bayaan kaa adhikansh hissaa keemtee nahin he.ise khanikon dwaara "potch" kaha jaataa he, yaa minerlogist dwaara saamaanya opel, kyonki yah rang kaa ek naatak nahin dikhaata he.Opaline silica na keval ullikhit bade voids ko bharti he, balki gaad or ret ke aakaar ke talachat main chhidr sthaan ko bhi bhar sakati he, jisamen anaaj ko ek saath cement kiya ja saktaa he, jo ki adwitiya jamaa kaa nirmaan karata he, jise matrix, opelaifed sandstone yaa "kancreet" ke rup main janaa jaataa he jo ki aadhaar ke paas ek adhik samooh ikai he.praarambhik cretecius talachat.

opel ke prakaaron main kai vividhtaayen kai karkon par nirbhar karti hai.vishesh rup se, jalwaayu baari -baari se geeli or sukhi avadhi pradaan karti he, jisase ek badhati yaa adhik mahatvapurn rup se girane vaali pani kii mej banati he jo samaadhaan main kisi bhi silica ko kendrit karti he.silica swayan jwalamukhi mul dwaara yaa silica or safed kaolin donon kaa utpaadan karne vaale cretecius mitti ke talachat ke gahare apkshay dwaara banaai jaati he, jo aksar australian opel kshetron se judi hoti he.opel kii apni vividhta ke utpaadan ke liye anuthi sthiti pradaan karne ke liye ek girte pani kii mej ko dhimaa karne ke liye vishesh paristhitiyon ko bhi prabal hona chahie.

opieel ke utpaadan ke liye jimmedaar rasinic sthitiyon par abhi bhi shodh kiya ja rahaa he, haalanki kuch yah banaae rakhte hai ki silica gole banane ke liye prakriya ke dauraan kisi charan main amleey sthiti honi chahie, sambhawatah rogaanuon dwaara banaai gai.

jabaki jwalamukhi-mejabani or anya prakaar ke keemtee opel australia main paae jate hai, vastutah sabhi aarthik utpaadan mahaan australian basin se jude talachat-hosted diposit se aata he.australia main prakritik talachat-mejabani vaale keemtee opel kii teen pramukh kismein hai-new south wales main litening rij se blike opels, dakshin australia se safed opels or queensland boulder or matrix opel.
user
kabhi -kabhi, vishesh paristhitiyon main, jameen main choti silica genden banati hai.ve bas jate hai or in gendon kii paraten banaate hai.chalis meter kii gaharaai par ek centimetre kii motaai tak dher karne ke liye, lagbhag paanch million varshon main bahut lanbaa samay lagata he.jab genden samaan aakaar or aakaar hoti hai, to keemtee opel banane lagati he.in opels main 150 se 400 nanometer tak kii genden hoti hai jo vibhinn rangon ko darshaati hai jab un par prakaash chamakta he.

opel un jagahon par paaya jaataa he jahaan jane ke liye antaraal yaa khaali sthaan the.kuch chattani kshetron main, yah keval choti daraaren bharta he, jabaki anya sthanon main, talchhati chattaanon kii tarah, apkshay dwaara banaai gai vibhinn prakaar ke chhed hote hai.opel ret yaa gaad ke chote anaaj ke bich rikt sthaan bhi bhar saktaa he, unhen ek saath chipka saktaa he.yah matrix, opelaifed sandstone, yaa "kancreet" naamak adwitiya jamaa banaata he.

sabhi opel vishesh yaa keemtee nahin hai.kuch ko khanikon dwaara "potch" yaa vaigyanikon dwaara "kaaman opel" kaha jaataa he kyonki unke paas rangeen pratibimb nahin hai.opeline silica na keval bade antaraal ko bharti he, balki yah ret or gaad ke anaaj ke bich chote sthanon ko bhi bhar sakati he.yah anaaj ko ek saath chadi banaata he or vibhinn prakaar ke opel banaata he.

opel kaa prakaar kai chizon par nirbhar karata he.mausam ek badi bhoomika nibhaataa he, iske baari -baari se geele or sookhe avadhiyon ke saath jo jameen main jal str ko prabhavit karata he.yah opel gathan ke liye aavashyak silica ko ikattha karne main madad karata he.silica jwalamukhiyon se yaa kuch mitti ke talachat ke gahare apkshay se aa sakati he.jalwaayu or anya vishesh paristhitiyaan bhi jal str ko dhimaa kar detii hai, jisase opel ke liye sahi sthiti paidaa hoti he.

vaigyanik abhi bhi adhyayan kar rahe hai ki opel kaise banataa he, lekin kuch log sochate hai ki amleey sthiti, sambhawatah chote jivit chizon dwaara banaai gai thi, jise rogaanu kaha jaataa he, prakriya ke liye aavashyak hai.

australia main, adhikansh moolyawaan opel mahaan australian basin se jude talchhati jamaaon main paae jate hai.vahaan teen mukhya prakaar ke keemtee opel paae jate hai: new south wales main litening rij se blike opel, dakshin australia se safed opel or queensland se boulder or matrix opel.
assistant
<|system|>
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<|user|>
ise phir se likhen taaki ek baccha ise samaj sake

kabhi-kabhi, jab sthitiyaan adarsh hoti hai, to silica ke gole, prithvi ke rup main silica-samrudh samaadhaanon main nihit hote hai or silica gole kii paraton ko banane ke liye ek shunya main gurutvkarshan ke neeche bas jate hai.mana jaataa he ki samaadhaan ke paas chalis meter kii gaharaai par paanch million varshon main lagbhag ek centimetre motaai ke bayaan kii dar he.yadi prakriya kshetron ko samaan aakaar tak pahunchane kii anumati detii he, to keemtee opel banane ke liye shuru hota he.keemtee opel ke liye kshetra kaa aakaar lagbhag 150 se 400 nanometer tak hota he, jo 400 se 700 nanometer kii drishy prakaash seemaa main vivartan dwaara rang kaa ek naatak paidaa karata he.

prayek sthaneey opel kshetra yaa ghatana main opel bayaan ke liye ek site pradaan karne ke liye kisi prakaar ke voids yaa porosity hona chahie.jwalamukhi chattaanon or aas -paas ke vaataavaran main opel keval vughs or daraaren bharne ke liye prakat hota he jabaki talchhati chattaanon main apkshay prakriya dwaara banaai gai vibhinn prakaar ke voids hote hai.boulder, nodeul, kai alag -alag jeevashmon se carbonate kii leaching, maujuuda daraaren ke saath, yranstone nodeules or kshaitij seem ke khule centre opel jaise dwitiyak khanijon ke jamaav ke liye taiyaar molds kaa asankhya pradaan karte hai.

opel bayaan kaa adhikansh hissaa keemtee nahin he.ise khanikon dwaara "potch" kaha jaataa he, yaa minerlogist dwaara saamaanya opel, kyonki yah rang kaa ek naatak nahin dikhaata he.Opaline silica na keval ullikhit bade voids ko bharti he, balki gaad or ret ke aakaar ke talachat main chhidr sthaan ko bhi bhar sakati he, jisamen anaaj ko ek saath cement kiya ja saktaa he, jo ki adwitiya jamaa kaa nirmaan karata he, jise matrix, opelaifed sandstone yaa "kancreet" ke rup main janaa jaataa he jo ki aadhaar ke paas ek adhik samooh ikai he.praarambhik cretecius talachat.

opel ke prakaaron main kai vividhtaayen kai karkon par nirbhar karti hai.vishesh rup se, jalwaayu baari -baari se geeli or sukhi avadhi pradaan karti he, jisase ek badhati yaa adhik mahatvapurn rup se girane vaali pani kii mej banati he jo samaadhaan main kisi bhi silica ko kendrit karti he.silica swayan jwalamukhi mul dwaara yaa silica or safed kaolin donon kaa utpaadan karne vaale cretecius mitti ke talachat ke gahare apkshay dwaara banaai jaati he, jo aksar australian opel kshetron se judi hoti he.opel kii apni vividhta ke utpaadan ke liye anuthi sthiti pradaan karne ke liye ek girte pani kii mej ko dhimaa karne ke liye vishesh paristhitiyon ko bhi prabal hona chahie.

opieel ke utpaadan ke liye jimmedaar rasinic sthitiyon par abhi bhi shodh kiya ja rahaa he, haalanki kuch yah banaae rakhte hai ki silica gole banane ke liye prakriya ke dauraan kisi charan main amleey sthiti honi chahie, sambhawatah rogaanuon dwaara banaai gai.

jabaki jwalamukhi-mejabani or anya prakaar ke keemtee opel australia main paae jate hai, vastutah sabhi aarthik utpaadan mahaan australian basin se jude talachat-hosted diposit se aata he.australia main prakritik talachat-mejabani vaale keemtee opel kii teen pramukh kismein hai-new south wales main litening rij se blike opels, dakshin australia se safed opels or queensland boulder or matrix opel.</s>
<|assistant|>
kabhi -kabhi, vishesh paristhitiyon main, jameen main choti silica genden banati hai.ve bas jate hai or in gendon kii paraten banaate hai.chalis meter kii gaharaai par ek centimetre kii motaai tak dher karne ke liye, lagbhag paanch million varshon main bahut lanbaa samay lagata he.jab genden samaan aakaar or aakaar hoti hai, to keemtee opel banane lagati he.in opels main 150 se 400 nanometer tak kii genden hoti hai jo vibhinn rangon ko darshaati hai jab un par prakaash chamakta he.

opel un jagahon par paaya jaataa he jahaan jane ke liye antaraal yaa khaali sthaan the.kuch chattani kshetron main, yah keval choti daraaren bharta he, jabaki anya sthanon main, talchhati chattaanon kii tarah, apkshay dwaara banaai gai vibhinn prakaar ke chhed hote hai.opel ret yaa gaad ke chote anaaj ke bich rikt sthaan bhi bhar saktaa he, unhen ek saath chipka saktaa he.yah matrix, opelaifed sandstone, yaa "kancreet" naamak adwitiya jamaa banaata he.

sabhi opel vishesh yaa keemtee nahin hai.kuch ko khanikon dwaara "potch" yaa vaigyanikon dwaara "kaaman opel" kaha jaataa he kyonki unke paas rangeen pratibimb nahin hai.opeline silica na keval bade antaraal ko bharti he, balki yah ret or gaad ke anaaj ke bich chote sthanon ko bhi bhar sakati he.yah anaaj ko ek saath chadi banaata he or vibhinn prakaar ke opel banaata he.

opel kaa prakaar kai chizon par nirbhar karata he.mausam ek badi bhoomika nibhaataa he, iske baari -baari se geele or sookhe avadhiyon ke saath jo jameen main jal str ko prabhavit karata he.yah opel gathan ke liye aavashyak silica ko ikattha karne main madad karata he.silica jwalamukhiyon se yaa kuch mitti ke talachat ke gahare apkshay se aa sakati he.jalwaayu or anya vishesh paristhitiyaan bhi jal str ko dhimaa kar detii hai, jisase opel ke liye sahi sthiti paidaa hoti he.

vaigyanik abhi bhi adhyayan kar rahe hai ki opel kaise banataa he, lekin kuch log sochate hai ki amleey sthiti, sambhawatah chote jivit chizon dwaara banaai gai thi, jise rogaanu kaha jaataa he, prakriya ke liye aavashyak hai.

australia main, adhikansh moolyawaan opel mahaan australian basin se jude talchhati jamaaon main paae jate hai.vahaan teen mukhya prakaar ke keemtee opel paae jate hai: new south wales main litening rij se blike opel, dakshin australia se safed opel or queensland se boulder or matrix opel.</s>
