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Agate

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Agate

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  1. Agate

  2. Agate can be fossilized living material From Green River formation, Wyoming Agatized coral, can be called “Petoskey stone”

  3. Uses • ornaments such as pins, brooches, paper knives, inkstands, marbles and seals. • mortars and pestles to crush and mix chemicals. • used for centuries for leather burnishing tools. • The sanctuary of a Presbyterian church in Yachats, Oregon, has six windows with panes made of agates collected from the local beaches • archaeological recovery at the Knossos site on Crete illustrates its role in Bronze Age Minoan culture. Church in Yachats Knossos

  4. Oregon SunstoneThe official state gemstone! Found in Harney County, Oregon and in eastern Lake County north of Plush

  5. Oregon’s state gemstone is a feldspar crystal that weathers out of certain lava flows in south-central Oregon.

  6. Uses • When a mineral or rock can be used for jewelry it is considered a gemstone • Oregon sunstone is a gemstone

  7. Hematite

  8. Mined to be turned into iron and then to steel; 90% of all iron in U.S. is produced from hematite Originally used as a pigment to color pottery Uses

  9. Olivine

  10. In the U.S., found in Hawaii, Arizona

  11. Refractory brick: Used as furnace lining in steel industry (high melting point) Uses • Used as gemstones

  12. Muscovite

  13. Uses • As windows on high temperature ovens • In past, used to make circuit boards • Historically, used as window panes