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the hardest mineral

См. также в других словарях:

  • Mineral — For other uses, see Mineral (disambiguation). An assortment of minerals. A mineral is a naturally occurring …   Wikipedia

  • Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …   Wikipedia

  • Humanitarian response to the 2004 Indian Ocean earthquake — The humanitarian response to the 2004 Indian Ocean earthquake was prompted by one of the worst natural disasters of modern times. On 26 December 2004, the earthquake, which struck off the northwest coast of the Indonesian island of Sumatra,… …   Wikipedia

  • Metallurgy during the Copper Age in Europe — The Copper Age, also called the Eneolithic or the Chalcolithic Age, has been traditionally understood as a transitional period between the Neolithic and the Bronze Age, in which a gradual introduction of the metal (native copper) took place,… …   Wikipedia

  • Hardest — Hard Hard (h[aum]rd), a. [Compar. {Harder} ( [ e]r); superl. {Hardest}.] [OE. hard, heard, AS. heard; akin to OS. & D. hard, G. hart, OHG. herti, harti, Icel. har[eth]r, Dan. haard, Sw. h[*a]rd, Goth. hardus, Gr. kraty s strong, ka rtos, kra tos …   The Collaborative International Dictionary of English

  • Geology of the Falkland Islands — The geology of the Falkland Islands has its origins in events of more than 400 million years bp, before the Falkland Islands existed as separate entities, with the appearance of intruded dikes in the crust of the supercontinent Gondwana. The… …   Wikipedia

  • PRECIOUS STONES AND JEWELRY — In the Bible Precious stones are mentioned in various contexts in the Bible, the most comprehensive list appearing in the description of the breastpiece worn by the high priest. The breastpiece was set with 12 precious stones arranged in four… …   Encyclopedia of Judaism

  • Jade use in Mesoamerica — s, symbolic weapons, and other objects. The general term jade refers to two separate rock types. The first is called nephrite, a calcium and magnesium rich amphibole mineral. Nephrite does not exist in Mesoamerica. The second is jadeitite, a… …   Wikipedia

  • Sailor Mercury — Sailor Moon character Ami in her Super Sailor Mercury form as seen in the anime. First appearance (See below) …   Wikipedia

  • materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …   Universalium

  • industrial diamond — ▪ mineral       any diamond that is designated for industrial use, principally as a cutting tool or abrasive. In general, industrial diamonds are too badly flawed, irregularly shaped, poorly coloured, or small to be of value as gems, but they are …   Universalium

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