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  2. Greenschist - Wikipedia

    en.wikipedia.org/wiki/Greenschist

    Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...

  3. Glauconite - Wikipedia

    en.wikipedia.org/wiki/Glauconite

    Identification; Color: Blue green, green, yellow green ... referring to the common blue-green color of the ... It is a silty-clayed sedimentary rock, laminated ...

  4. Jadeite - Wikipedia

    en.wikipedia.org/wiki/Jadeite

    Jade rock inspection with a portable UV LED flashlight in Mandalay Jade Market. Jadeite's color commonly ranges from white through pale apple green to deep jade green but can also be blue-green (like the recently rediscovered "Olmec Blue" jade), pink, lavender and a multitude of other rare colors. Chloromelanite is a very dark green to black ...

  5. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Rhyodacite – Volcanic rock rich in silica and low in alkali metal oxides – A felsic volcanic rock which is intermediate between a rhyolite and a dacite; Rhyolite – Igneous, volcanic rock, of felsic (silica-rich) composition Comendite – Hard, peralkaline igneous rock, a type of light blue grey rhyolite

  6. Larimar - Wikipedia

    en.wikipedia.org/wiki/Larimar

    Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in Dominican Republic, around the city of Barahona. [4] Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many ...

  7. Serpentine subgroup - Wikipedia

    en.wikipedia.org/wiki/Serpentine_subgroup

    Serpentine subgroup is a set of common rock-forming hydrous magnesium iron phyllosilicate ((Mg,Fe) 3 Si 2 O 5 4) minerals, resulting from the metamorphism of the minerals that are contained in mafic to ultramafic rocks. [6] They may contain minor amounts of other elements including chromium, manganese, cobalt or nickel.

  8. What is the birthstone for December? Hint: There's actually ...

    www.aol.com/birthstone-december-hint-theres...

    The stone spans from blue to green in color. Occasionally, a dark, spiderweb likeness, known as a "matrix", can be found on the stone.

  9. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [16] Opal is also formed by ...