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The Olympic Australis opal is the largest and most valuable opal yet found (as of 1961) [1] and was valued at A$2,500,000 in 1997. [2] It was found in 1956 at the 'Eight Mile' opal field near the town of Coober Pedy in South Australia. [3] The opal was found at a depth of 9.1 metres (30 ft).
Wood opal, also known as xylopal, [51] [52] is a form of opal, [53] as well as a type of petrified wood which has developed an opalescent sheen or, more rarely, where the wood has been completely replaced by opal.
Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm
Opal equipment was designed from the start to support a variety of cards, but launched with the captive Opal cards. Opal cards are the standard method of paying for fares on the Opal system. The card is a credit card-sized smartcard which includes a microchip and internal RFID aerial, allowing the card to communicate with readers. The microchip ...
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In organic chemistry, amine value is a measure of the nitrogen content of an organic molecule. [1] Specifically, it is usually used to measure the amine content of amine functional compounds. [ 2 ] It may be defined as the number of milligrams of potassium hydroxide (KOH) equivalent to one gram of epoxy hardener resin.
Thatch explains what qualifies as expenses for HRAs, QSEHRAs, and ICHRAs when it comes to medical costs, premiums, and more in this comprehensive guide.