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2. Fire agate - Wikipedia

   en.wikipedia.org/wiki/Fire_agate

   Fire agates have beautiful iridescent rainbow colors, similar to opal. They have a hardness of 6.5-7 on the Mohs scale, [1] which reduces the occurrence of scratching when polished gemstones are set in jewelry. The vibrant iridescent rainbow colors found within fire agates are created by the Schiller effect, which is also found in mother-of-pearl.

3. Agate - Wikipedia

   en.wikipedia.org/wiki/Agate

   Holley blue agate (also spelled "Holly blue agate") is a rare lavender to blue agate found only near Holley, Oregon. [9] Patuxent River stone is a red and yellow form of agate only found in Maryland, where it is the state gem. [23] Sweetwater agates are small moss agates found in Miocene age sandstone near Sweetwater River

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

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

   Montana Agate (1969) Nebraska [45] Prairie agate (1967) Blue chalcedony (1967) Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's ...

5. Chiastolite - Wikipedia

   en.wikipedia.org/wiki/Chiastolite

   Specimen from Santiago de Compostela, Spain. Chiastolite (/ k aɪ ˈ æ s t ə ˌ l aɪ t / ky-ASS-tə-lyte) [1] is a variety of the mineral andalusite with the chemical composition Al 2 SiO 5. ...

6. Dzi bead - Wikipedia

   en.wikipedia.org/wiki/Dzi_bead

   Sometimes natural bands agate beads without and artificial etchings are also viewed as a type of dzi by Tibetans. The number of "eyes", or circular designs on the stone, is considered significant when considering the importance of a dzi. The symbolic meaning of dzi beads are sometimes based on the number and arrangement of the dots. [citation ...

7. Fairburn Agate - Wikipedia

   en.wikipedia.org/wiki/Fairburn_Agate

   The Fairburn Agate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone of South Dakota. [ 1 ] Fairburns are characterized from other types of agate by their colors and the shape of the bands.