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Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...
a patchy blue colour distribution on some facets; white facet junctions, irregular white abrasions and surface pits, where the treatment either did not "take" or had been abraded away. The brilliant color of these products is the result of optical interference effects produced by layers of metal.
A cortado is a Spanish beverage consisting of espresso mixed with a roughly equal amount of warm milk to reduce the acidity, [1] [2] although the exact ratios have considerable regional variation. [3] The milk in a cortado is steamed, but not frothy and "texturized" as in many Italian coffee drinks. [4] The cortado is commonly served all over ...
White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [5] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [4] Copper ...
A true flat white ought to have the same quantity of extracted coffee as any other beverage on the coffee menu (generally 30 ml, 1.1 imp fl oz) but because it is served in a smaller vessel (175 ml, 6.2 imp fl oz) it has stronger flavour than say a latte which is normally served in a 225 ml (7.9 imp fl oz) vessel and is subsequently milkier.
Quartz porphyry from the island of Alnö, Sweden. Phenocrysts of clear glassy rounded quartz and white orthoclase feldspar are set in a fine-grained matrix. Sample is just over 10 cm long. Quartz-porphyry, in layman's terms, is a type of volcanic rock containing large porphyritic crystals of quartz.
Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite.
Electrum was often referred to as "white gold" in ancient times but could be more accurately described as pale gold because it is usually pale yellow or yellowish-white in color. The modern use of the term white gold usually refers to gold alloyed with any one or a combination of nickel, silver, platinum and palladium to produce a silver ...