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Agate (/ ˈ æ É¡ 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 ...
Stringfellow Acid Pits a former rock quarry in Jurupa Valley in Riverside County, California, which became a toxic waste dump and later a Superfund site. Deemed one of the most polluted sites in California in 1980s, and associated with mismanagement and scandal in the U.S. Environmental Protection Agency.
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.
Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from the Latin word citrina which means "yellow" and is also the origin of the word "citron". Sometimes citrine and amethyst can be found together in the same crystal, which is then referred to as ametrine. [41]
Jurassic metaconglomerate at Los Peñasquitos Canyon Preserve, San Diego County, California Polymict metaconglomerate, sold as "Marinace Green Granite," from Bahia, Brazil. This rock is dominated by pebbles & granules of granite, gneiss, and mafic igneous rocks. Some clasts have been partially epidotized.
The Christmas PieCaken is a layered pie-cake dessert with slabs of Chocolate Pecan Pie, Eggnog Cheesecake, and Red Velvet Cake. ... This foldable storage shelf is on sale for under $60: 'It is ...
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