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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  3. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    As 99.9% pure thorium oxide, price per thorium contained. Free on Board port of entry, duty paid. 91: Pa: Protactinium: 15.37: 1.4×10 −6 [i] (3.878 × 10 10 kg) No reliable price available. In 1959–1961 Great Britain Atomic Energy Authority produced 125 g of 99.9% pure protactinium at a cost of $ 500 000, giving the cost of 4 000 000 USD ...

  4. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    The miners are usually paid between 17 and 23 cents per kilogram for rose quartz (less than a penny per ounce). [5] The miner's income may be just 0.1% of the final retail price. [ 5 ] Some people in the industry say that the low pay for miners is because customers in developed countries want low retail prices; others say that it is due to ...

  5. Rose quartz - Wikipedia

    en.wikipedia.org/?title=Rose_quartz&redirect=no

    From a subtopic: This is a redirect from a subtopic of the target article.. If the redirected subtopic could potentially have its own article in the future, then also tag the redirect with {{R with possibilities}} and {{R printworthy}}.

  6. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    Rose quartz (1966) Fairburn agate (1966) and State Jewelry: Black Hills Gold: Tennessee [66] Agate (2009) Limestone (from 1979 to present) and formerly.

  7. Gold mining in the United States - Wikipedia

    en.wikipedia.org/wiki/Gold_mining_in_the_United...

    Despite the new mining methods, by 1865 production was 867,000 troy ounces (27,000 kg), less than one-quarter of peak production. Production sank to 412,000 troy ounces (12,800 kg) in 1929, but then soared to more than 1,400,000 troy ounces (44,000 kg) for each year 1939 through 1941, after the price was raised from $20.67 to $35 per ounce.

  8. Desert rose (crystal) - Wikipedia

    en.wikipedia.org/wiki/Desert_rose_(crystal)

    A desert rose is an intricate rose -like formation of crystal clusters of gypsum or baryte, which include abundant sand grains. [1] The "petals" are crystals flattened on the c axis, fanning open in radiating clusters. The rosette crystal habit tends to occur when the crystals form in arid sandy conditions, [1] such as the evaporation of a ...

  9. International Prototype of the Kilogram - Wikipedia

    en.wikipedia.org/wiki/International_prototype_of...

    Gy = J/kg = ⁠ kg m 2 /s 2 / kg ⁠ = m 2 /s 2; S = 1/Ω = ⁠ 10 −7 s / k A m ⁠ H = Ω s = 10 7 k A m; Because the magnitude of many of the units composing the SI system of measurement was until 2019 defined by its mass, the quality of the IPK was diligently protected to preserve the integrity of the SI system.

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