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Aborigine browse these categories for related items... All Items: Artisan and Design: Jewelry: Necklaces: Contemporary: item # 727132 Please refer to our stock # J0089 when inquiring.
Classical Creations By Appointment Santa Barbara, California 805-562-8619 Guest Book $145.00 |
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22" necklace of fossilized sea urchin spines (ranging from 72mm to 93mm in length), 4mm fossilized agate, 8mm petrified wood, and 8x10mm hand-carved bone rondelles. The clasp is a handmade brass hook and eye. Our necklace is a geological conversation piece, and features many interesting specimens. The sea urchin is a small, spiny sea creature of the class Echinoidea found in oceans all over the world. Our spine fossils are in great condition -- primarily brown, with small bands of white and some red at the tips. They lived millions of years ago, and when they died, were buried in tons of mud. Over time, this hardened and became soft white limestone or chalk and the urchin spines became fossilized. The petrified wood (from the Greek root "petro" meaning "rock" or "stone", literally "wood turned into stone") is also a type of fossil, consisting of wood in which all the organic materials have been replaced with minerals (most often a silicate, such as quartz), while retaining the original structure of the wood. The petrifaction process occurs underground, when wood becomes buried under sediment and is initially preserved due to a lack of oxygen. Mineral-rich water flowing through the sediment deposits minerals in the plant's cells and as the plant decays, a stone mould forms in its place. Elements in the water/mud during the petrification process give petrified wood a variety of color ranges. In our beads, iron oxides caused the red, brown, and yellow tints, while manganese created the pink/orange tones. Fossil agate is generally formed in cavities and veins by deposition from meteoric groundwater containing gelatinous silica from the weathering of silicate minerals. It can also form by deposition from late hydrothermal solutions at or near the earth's surface under conditions of low temperature and low pressure. It is commonly associated with siliceous volcanics, and occurs as vein or vesicle filling. It also occurs as a petrifying agent in fossil wood and bone. Our fossil agate is in its typical neutral brownish shades. |
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