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  2. Mount Pentelicus - Wikipedia

    en.wikipedia.org/wiki/Mount_Pentelicus

    Pentelic marble is calcitic in composition with quartz as an accessory mineral. It is fine grained with sporadic calcitic fossil clasts . [ 2 ] [ 5 ] Pentelic marble is divided into 3 units distinguishable by δ 13 C and δ 18 O values. δ 13 C and δ 18 O values have been used to precisely match marbles from the Acropolis to their source quarries.

  3. Category:Quartz varieties - Wikipedia

    en.wikipedia.org/wiki/Category:Quartz_varieties

    Varieties of the mineral Quartz. Subcategories. This category has the following 2 subcategories, out of 2 total. C. Chert (3 C, 23 P) Q. Quartz gemstones (2 C, 18 P)

  4. Pental (company) - Wikipedia

    en.wikipedia.org/wiki/Pental_(company)

    Pental Limited is an Australian manufacturer of household chemicals and cleaning products, and a publicly listed company on the Australian Stock Exchange. Formerly known as Symex , [ 1 ] it manufactures , imports, distributes and exports many brands including: [ 2 ]

  5. Citrine (colour) - Wikipedia

    en.wikipedia.org/wiki/Citrine_(colour)

    Citrine / ˈ s ɪ t r iː n / is a colour, the most common reference for which is certain coloured varieties of quartz which are a medium deep shade of golden yellow. Citrine has been summarized at various times as yellow, greenish-yellow, brownish yellow or orange. [2] The original reference point for the citrine colour was the citron fruit.

  6. Pental - Wikipedia

    en.wikipedia.org/wiki/Pental

    Pental may refer to: A quinary or base 5 number system; Pental (company), an Australian manufacturer of cleaning products; Deepak Pental (born 1951), Indian academic ...

  7. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium.