CAVE PEARL Fluorescent Calcite Mineral Specimen Formation Concretion ENGLAND

$19.99 Buy It Now or Best Offer
free,30-Day Returns

Seller Store callistodesigns
(42696) 99.6%,

Location: Tucson, Arizona
Ships to: US,
Item: 395801952584

Restocking Fee:No
Return shipping will be paid by:Seller
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Type:Calcite
Size:11 mm x 11 mm x 7 mm
Country/Region of Manufacture:United Kingdom
Weight:1.12 grams

This specimen weighs 1.12 grams. It measures 11 mm x 11 mm x 7 mm. I offer a shipping discount for customers who combine their payments for multiple purchases into one payment! The discount is regular shipping price for the first item and just 50 cents for each additional item! To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart. Auctions you win are added to your cart automatically. For any “buy it now” items or second chance offers, be sure to click the “add to cart” button, NOT the “buy it now” button. Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically. I offer a money back guarantee on every item I sell. If you are not 100% happy with your purchase just send me a message to let me know and I will buy back the item for your full purchase price. Hi there, I am selling this beautiful cave pearl specimen. This comes from Teesdale, Durham, England. Cave peals are formed when water bearing calcite drips from the ceiling of a cave and lands on something on the floor, typically a grain of sand, that acts as the nucleus of the pearl. The reason this doesn’t form a stalagmite is that the water is moving too quickly and it causes the nucleus to turn and roll as the water is flowing. This causes the calcite to build up in layers all around the nucleus resulting in a lovely little pearl. Additionally, these cave pearls are fluorescent and phosphorescent. They fluoresce bright white under shortwave UV light and continue to glow for a second after the light is turned off. If you have any questions, do not hesitate to ask me. Have fun bidding, thanks so much for visiting my auction and have a great day! Cave pearlFrom Wikipedia, the free encyclopedia A cave pearl is a small, usually spherical, speleothem (cave formation) found in limestone caves. Cave pearls are formed by a concretion of calcium salts that form concentric layers around a nucleus. Exposure to moving water polishes the surface of cave pearls, making them glossy; if exposed to the air, cave pearls can degrade and appear rough. CompositionA cave pearl is composed primarily of calcite (calcium carbonate [CaCO3]). Cave pearls are generally not considered to be a type of oolite. Other minerals found in small quantities in cave pearls include quartz (silicon dioxide [SiO2]), apatite (a group of phosphate minerals), iron, aluminium, and magnesium.[1][2] FormationCave pearls form when water dripping into a cave loses carbon dioxide and precipitates calcite. A cave pearl forms when the water is moving too vigorously to form a stalagmite. A nucleus of matter (such as a grain of sand) becomes coated with calcite, and the current then provides a rotation to the nucleus in such a way that it is coated evenly. In this manner, concentric layers build up over time, in much the same way that a biological pearl forms within a mollusc. There may be microbial action involved in the formation of cave pearls.[3] The existence of an actual pool may not be necessary for cave pearls to form, as long as the deposit is kept wet and agitated by water dripping or trickling through.[4] If the cave pearl sinks to the bottom of a pool or is otherwise in direct contact with moving water, the motion of the water buffs it to a high gloss. Although the motion of the water often keeps cave pearls from adhering, sometimes cave pearls will stick to one another or to the bottom of a pool. NucleusA cave pearl forms around a nucleus of matter. The nucleus of a cave pearl is typically very small, such as a grain of sand, but can be larger.[5] Some nuclei are made of foreign matter (such as quartz sand, wood, bone, or even plastic), whereas others are made of calcified clay or limestone.[1] ShapeCave pearls are usually spherical but can also have other shapes. The reason cave pearls tend to be round is not due to erosion by rotation, but rather that their growth is steady and uniform. Because a spherical shape allows the greatest amount of deposition for the smallest surface area, a cave pearl tends to end up spherical even if its nucleus is highly irregular. Sometimes several cave pearls stick together to form a shape that resembles a bunch of grapes. In addition to the typical spherical shape, cave pearls can be cylindrical, elliptical, cubical, hexagonal, discoid, or irregular.[6] FrequencyCave pearls are relatively common in caves but are typically present in low abundance. In Tabasco, Mexico, the Gruta de las Canicas (Cave of the Marbles) is highly unusual in that it contains a tremendous quantity of pearls: an estimated 200 million pearls were discovered on the cave floor, in some areas to a depth of a meter or more. The mechanism for the formation of this vast quantity of pearls has not been determined.[2] The Rookery, in Carlsbad Caverns, New Mexico, has so many cave pearls that they were at one time handed out to visitors as souvenirs.[6] Inventory code: D

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