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2. Fire agate - Wikipedia

   en.wikipedia.org/wiki/Fire_agate

   Fire agate, a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States (New Mexico, Arizona and California). [1] Approximately 24-36 million years ago these areas were subjected to massive volcanic activity during the Tertiary Period.

3. Agate - Wikipedia

   en.wikipedia.org/wiki/Agate

   Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...

4. Chalcedony - Wikipedia

   en.wikipedia.org/wiki/Chalcedony

   Fire agate. Fire agate is a variety of chalcedony with inclusions of goethite or limonite causing an iridescent effect. [10] It can display a wide range of iridescent colors including red, orange, yellow, green, blue, and purple. [11]

5. 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 ...

6. Lake Superior agate - Wikipedia

   en.wikipedia.org/wiki/Lake_Superior_agate

   The gas pockets in which the agates formed were primarily small, about 1 cm in diameter. A few Lake Superior agates have been found that are 22 cm in diameter with a mass exceeding 10 kilograms. Very large agates are extremely rare. The most common type of Lake Superior agate is the fortification agate with its eye-catching banding patterns ...

7. Category:Agates - Wikipedia

   en.wikipedia.org/wiki/Category:Agates

   Fire agate; L. Lake Superior agate; M. Moss agate; P. Patuxent River stone; R. Rubens Vase; T. Turritella agate This page was last edited on 30 May 2016, at 11:25 ...