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  2. Amazonite - Wikipedia

    en.wikipedia.org/wiki/Amazonite

    Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [4] [5] [6] Its chemical formula is KAlSi 3 O 8, [1] [7] which is polymorphic to orthoclase . Its name is taken from that of the Amazon River, from which green stones were formerly obtained, though it is unknown ...

  3. Verdigris - Wikipedia

    en.wikipedia.org/wiki/Verdigris

    Verdigris in Prague Underground. Verdigris is a collective term for copper acetate, whose chemical varieties produce different hues. The technical literature is inconsistent in describing these variations. Some sources refer to "neutral verdigris" as copper (II) acetate monohydrate ( Cu (CH3CO2)2· (H2O)) and to "blue verdigris" as Cu (CH3CO2)2 ...

  4. Turquoise (color) - Wikipedia

    en.wikipedia.org/wiki/Turquoise_(color)

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 ( P O 4) 4 (O H) 8· 4 H 2 O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue. A turquoise dome of the Po-i-Kalyan Mosque in ...

  5. Purple-edged copper - Wikipedia

    en.wikipedia.org/wiki/Purple-edged_Copper

    Description. Lycaena hippothoe can reach a wingspan of 34–38 millimetres (1.3–1.5 in). [7] [5] The upperface of the wings is deep orange-red in males, with a brown or purple edging (hence the common name). The spots in the forewing post discal row form an arc.

  6. Jade - Wikipedia

    en.wikipedia.org/wiki/Jade

    Jade. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments. Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals ...

  7. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis is the Latin word for "stone" and lazulī is the genitive form of the Medieval Latin lazulum, which is taken from the Arabic لازورد lāzaward, itself from the Persian لاژورد lāžavard/lāževard and/or لاجورد lājevard. It means "sky" or "heaven"; so this is a "stone (of/from) the sky" or "stone (of/from) heaven". [11]