what was the most famous of stone circles used for?
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If your talking about Stone Henge they believe that the stones were used like a calender.
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Your best bet is to take the ring to a jewelry store and ask them about the ring. Some people who have been in the buisness a long time may be able to tell you some of the history on different stones etc.
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Check out this site:  THere is a video all about Tibetan Sand Mandalas....\n\nMandala (Sanskrit maṇḍala "circle") is of Hindu origin, but is also used in a Buddhist context, to refer to various tangible objects. In practice, mandala has become a generic term for any plan, chart, or geometric pattern which represents the cosmos metaphysically or symbolically, a microcosm of the universe from the human perspective.\n\nA mandala, especially its center, can be used during meditation as an object for focusing attention. The symmetrical geometric shapes which mandalas tend to have, draw the attention of the eyes towards their center. Psychiatrist Carl Jung saw the mandala as a representation of the unconscious self. His paintings of mandalas enabled him to identify disorders, and achieve wholeness in personality (Jung: Memories, Dreams, Reflections, pp. 186-197).
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The pentagram is an ancient symbol which is currently used in witchcraft and other pagan religions.  Each of the five points symbolizes a force (earth, air, fire, water, spirit) the center symbolizing the combination of those five forces.
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14lbs\n\nStone (weight)\nFrom Wikipedia, the free encyclopedia.\nJump to: navigation, search\n\nA stone is a unit of mass in the Imperial system of weights and measures used in the United Kingdom, Ireland, and most Commonwealth countries. It is equal to 14 pounds avoirdupois, or 6.35029318 kilograms.\n\nThough no longer an official unit of measure – in medical and other technical contexts kilograms are used – the stone remains almost universally popular for use in Britain and Ireland as a means of expressing human body weight. People in these countries would normally describe themselves as weighing, for example, "11 stone 4" (11 stone and 4 pounds).\n\nIt was also frequently used in the past for weighing agricultural commodities. Potatoes, for example, were traditionally sold in stones or half-stones (14-pound or 7-pound quantities).\n\nIn the United States and Canada, where stone as a unit of weight is generally unknown, people would normally describe themselves as weighing "158 pounds" (using the same amount of weight as in the previous example). This usage of pounds alone to express body weight is very unusual in Britain and Ireland.
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1.  A Stone Mason, a master mason was the engineer, and supervisor in a major construction project that would last for years. See the novel by Ken Follett, "The Pillars of the Earth"\n2. Read the book\n3. The Keep
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Stonehenge was probably built by transferring huge slabs of stone and sculpting them by lighting them on fire, and then pouring cold water on them. Nobody really knows why. Some people claim it was built by the Druids as an altar. It also could have been an astronomy site. \nMy question is this: why build it out of extremely heavy stone when there was wood in abundance? ( Whoever built it probably transported the stone on rollers.)
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A carving or line drawing on rock, especially one made by prehistoric people.
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It would help to find useful archaeologists if you tell where you found those slate stones. While I know a couple of archaeologists, they are specialized on Aegean Bronze Age or Viking Age rather than Stone Age Britain, which wouldn't be too helpful.
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the careful placing and fitting of uncut stones without use of mortar\n\nused for fences in newengland and europe, or more rarely as structural elements in late colonial and earlier structures.\n\nnot suitable where structural codes exist
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No list would be complete without the most famous unconformity in all of geology -- that at Siccar Point in southeastern Scotland, the site where James Hutton, the father of modern geology, realized that unconformities represent gaps in the sedimentary record that may encompass millions of years.\n\nIn the sea cliffs at Siccar Point, flat-lying red shales overly nearly vertical gray shales.  Hutton saw that the gray shales must have been uplifted, deformed, eroded, and then once again innundated by the marine environment in which the red sandstones were deposited.  He further realized that this series of events must have taken an enormous amount of time, far longer than what was the then-accepted 4000-year "Biblical" age of the Earth. \n\nPics of the unconformity are given in the source below (as well as many more places on the Web).
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The stone is a unit of mass in the Imperial system of weights and measures used in the United Kingdom, Ireland, and most Commonwealth countries. It is equal to 14 pounds or 6.35029318 kilograms.
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The first Argonauts of 1848 used quite primitive mining tools: knives, spoons, a shovel, and a pan for washing the gold. Since these miners could only dig out bigger nuggets with such primitive equipment, they had to work on rich gold deposits. In the same year, technical improvements such as the cradle, the rocker, the long tom, and river damming, basically all known since the Middle Ages, were introduced by the more experienced Mexicans. The cradle and the rocker both worked on the same principle: wooden boxes with the top and front piece missing and a sieve on the bottom side through which the dirt containing gold was washed. On the bottom horizontal wooden bars slowed the incoming water down and helped to separate dirt from gold. With a handle on the side of the box, the whole mechanism could be rocked. The rocker required 3 or 4 people to work, one to shovel the dirt into the machine, one responsible for the water supply, and a third one to move the handle. Contrary to the individual washing with the pan, this more efficient technique required miners to find partners, thus establishing small mining groups of 3 to 9 people.\n\nThe long tom functioned similarly to the rocker but increased its efficiency. It also had the shape of a trough, but it was much larger, 12 to 15 feet long and about 2 feet wide. Mainly made out of wood, it had a metal bottom with a sieve and a ripple box at its end. This machine was put up with a slight slope, thus facilitating the water flow. While one man shoveled dirt into the long tom, making sure that the water was running, another mixed water and dirt while taking out big stones that could damage the sieve. At the end of the day, the dirt was taken out of the box and washed in a pan. Six to eight men had to work a long tom to fully exploit its capacities. A few miners started to employ the long tom at the end of 1848, and by 1850 it became a common machine.
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It's called a Great Circle
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the chisel end is for splitting rocks down a plain of weakness the flat end is mostly used with a chisel . Be aware of the local bylaws when rock tapping as in some places the are laws forbidding damage to cliff and rock in any way whatever and can lead to a fine.In the UK sites of scientific interest are all protected as are a lot of site in the US.
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The Least Known Legend. One of the least known origins that has been researched is the coin known as the "Silver Shekel" or "Shekel of Israel" which was issued in A.D. 68 after a Jewish revolt against the Romans. One side of the coin depicted three pomegranates, with a common stalk. \n\nThe Traditional Legend of the Three Balls. The symbol of the three balls was part of the coat of arms of the Medici family, who established the Medici trading and banking empire in Florence, Italy. The Medicis were a 15th century Italian family of bankers and lenders, with considerable fame and fortune. They became so well known in the finance and lending profession that the other lenders, wanting to share in their success, adopted similar coats of arms, signs, shields and symbols, with three golden balls being the most popular. Once other merchants involved in monetary dealing adopted the three golden balls as their symbol, the three balls came to symbolize the entire profession founded on the ethic of mutual trust
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John M. Hickman is one of the 2005 American Masters Of Stone\nHis work is known in a small circle of lapidaries and is prized by many collectors. He is the creator of the quiltedstone. These stones resemble geometrical designs that are made up of pieces of stone from around the world. They are fashioned to be used in jewelry as cabachons and beads.