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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.
Unless stated otherwise, the properties of fused silica (quartz glass) and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors (in general more than 10 independent sources for quartz glass and T g of germanium oxide glass). The list is not exhaustive.
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.
A flat white is an espresso with microfoam (steamed milk with small, fine bubbles and a glossy or velvety consistency). It is comparable to a latte, but smaller in volume and with less microfoam, therefore having a higher proportion of coffee to milk, and milk that is more velvety in consistency – allowing the espresso to dominate the flavour ...
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 ...
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.
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.
The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminium result in the color variations. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet.