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Opal: Quiz


Question 1: The triplet-cut opal backs the colored material with a dark backing, and then has a domed cap of clear ________ or plastic on top, which takes a high polish and acts as a protective layer for the relatively fragile opal.

Question 2: Where the distance between the regularly packed planes of spheres is approximately half the wavelength of a component of visible light, the light of that wavelength may be subject to ________ from the grating created by the stacked planes.
Electromagnetic radiationLaserDiffractionHolography

Question 3:
What transport system is Opal served by?
Monoclinic 2/m
NSW Country lines

Question 4: Opal is considered the ________ for people born in October or under the sign of Libra and the star stone for people born under Scorpio.

Question 5: Two notable producers of synthetic opal are the companies ________ and Inamori of Japan.
Canon (company)Hitachi Ltd.KyoceraFANUC

Question 6: When a drop of ________ falls on the talisman, the opal turns into a colorless stone and the Baroness dies soon thereafter.
SacramentalsBaptismHoly waterOrthodox Church

Question 7: This is the basis of the optical ________ in a photonic crystal, of which opal is the best known natural example.
Band gapGallium arsenideSemiconductorElectronic band structure

Question 8: The largest black opal in the ________ comes from the Royal Peacock opal mine in the Virgin Valley.
National MallUnited States CapitolSmithsonian InstitutionWashington, D.C.

Question 9: The town of Coober Pedy in ________ is a major source of opal.
Northern TerritoryVictoria (Australia)Western AustraliaSouth Australia

Question 10: [10][11] Following the publication of Sir ________'s Anne of Geierstein in 1829, however, opal acquired a less auspicious reputation.
Robert BurnsVictor HugoSamuel Taylor ColeridgeWalter Scott


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