where are emerald found? how is emerlad procude or gotten? is emerald rare or abundant?
116630
Emerald (Be3Al2SiO6) is a variety of the mineral beryl, Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds.\n\n It is highly prized as a gemstone and by weight is the most valuable gemstone in the world. Emerald is regarded as the traditional birthstone for May. According to legend, the emerald has the power to protect the chastity of the wearer and to ward off evil spirits.  \n\nThe emerald was highly esteemed in antiquity; the stones were used for ornaments in early Egypt where some of the first emeralds were mined. The finest emeralds are found in South America in Colombia, where they have been mined for over 400 years.   Colombia is the preeminent exporter of emeralds in the world.\n\nIndia, Zimbabwe, and Australia are minor sources of the natural stones. Synthetic emeralds are also manufactured in Germany, France, and the United States.\n\nEmerald is a rare and valuable gemstone and, as such, provided the incentive for developing synthetic emeralds. Both hydrothermal and flux-growth synthetics have been produced and a method has been developed for producing an emerald overgrowth on colorless beryl. Synthetic emeralds fluoresce a dull red with long wave UV light due to an indicator added during the process of synthesizing the emerald, whereas natural specimens do not
1027438
Platinum rarely occurs naturally on it's own & therefore must be obtained from rock ore that contains platinum & other economically important minerals.\n\nPlatinum is usually associated w/ nickel deposits.\n\nWhen the ore is mined, it is then crushed. The mineral is extracted through smelting.\n\nFor more detailed information click on the link below.
1001175
How to answer this?  I actually have several books entirely on how gems are faked or modified and the con census is that it can be difficult at best.  To find out what sort of stones you are likely to find in any given area do a general search on the geology of it and the surrounding countries.  If you are lucky he might find some Persian Spider Web Turquoise from Iran (though the mines are supposed to be played out now) as you should figure in the trade routes between the other countries as well.  I know the area is copper rich so turquoise and malachite almost certainly.  Try doing a search on "GEMS OF AFGHANISTAN".  From there you can refine your search parameters and add in secondary searches of fake and altered stone.  By the way, fake and altered are not the same as many gems can be treated by heat, radiation and other methods to improve the quality.  They are still the same type of gem just a better grade than they started out as.
557786
Extremely RARE \n\n-- ALL THE VERY BEST , in any case !\n\n(don't forget me , when u've got it)
297227
Feldspar is one of the most abundant minerals on the planet being found in many types of rocks. Feldspar is easily broken down by weathering processes.\n\nThe following are a list of reputable sites. Although wikipedia has a lot of informtion it is not listed as a credible site. Anyone can list information there as they can here.
62403
Must be another geologist!\n\nLook up the paper in GeoRef.\n\nFind it in the library or get it on interlibrary loan.\n\nLet us know if you find gold or diamonds!
560780
No country produces that much. The largest country that produces emeralds is Colombia at 60% followed by Zambia (15%), Brazil (10%), Russia (5%), Madagascar (3%), Zimbabwe (2%), and Pakistan and Afghanistan (together 5%)
450849
Diamonds are not rare. South Africa has a bunch in storage that they hide until the current ones are sold.\n\nAs for worth, that depends on the size of the diamond, cut, clarity, and flaws---and the current market price.
226208
Beryllium gets very hot such as near a volcano.\n\n\nNot all Emeralds are formed in a hydrothermal vein. Some Emeralds are formed in pegmatite deposits. Pegmatites are similar to hydrothermal veins, except that the primary agent in hydrothermal vein formation is hot water and the primary agent in pegmatites is magma, or molten rock. As this magma begins to cool, some elements are left in solution in the remaining fluid. When the necessary elements are present and if conditions are perfect, Emerald crystal formation may occur in these pegmatites.
687694
Yes. Generally, certain locations are associated with the better quality gemstones. This would be the case of Columbian emeralds, Burmese rubies and Cashmere sapphires. \nColor in gemstones, for example can respond to different reasons. The  main factors that imbue color in a gemstone are two: an element that is part of the basic formula of the mineral species (and this would make a gemstone always have the same color, caused by the same element); or, on the contrary, an element that becomes part of the mineral species during the forming of the specimen, and that is not necessarily within the formula of the mineral. \nColoring in gemstones such as emeralds, rubies, sapphires, fancy diamonds etc. responds to this second cause. If the color of emeralds depends on what element came to -casually- become a part of them, you can see how the geographic origin of a stone has a lot to do with color. \nColumbian emeralds, for example, are colored by chrome (so are rubies, generally), which provides the nicer, more intense grass-green. Emeralds in Brazil and Africa are colored by other elements, that don't impart such a vivid or valuable color. \nThere has been, in fact, a lot of talk about whether one can call an emerald any grass-green beryl, or whether the term "emerald" can only be applied to those green beryls that have been colored by chrome. Since only Columbian emeralds owe their color to chrome, ruling out every other emerald would enormously dwarf the value of emeralds from other origins, so nowadays, all green-grass beryl is called emerald. \nThe same goes for clarity: different geographic regions are more likely to present different kinds of inclussions. As much as in diamonds, inclussions are considered a negative on value, the case with gemstones is other. As inclussions can identify the origin of a gemstone, inclussions that point to the better-quality origins are valued as possitive factors, that may increase the price. This is the case of tri-phasic inclussions in Columbian emeralds (inclussions formed by gas, liquid and a solid cristal); rutile "silks" in Burmese rubies (short ruitle needles that make the inside of the stone look silky) or a slightly murky, opalescent appearance on Cashmere sapphires. \nCertain regions have also produced, generally speaking, larger crystals, although the rough size of a gemstone actually depends more under what temperatures and pressure that species generally forms. The larger the temperature and pressure, the smaller the crystals (generally). Temperature and pressure depend on the depth of formation: the same mine may have, for example, garnets and diamonds in its deeper parts, and beryl towards the top (aquamarine, emeralds...). This is just an example, though... If you would like more information on forming, you probably should refer to a specific book on the matter. \nOrigin, however, is not any kind of guarantee: as much as Columbia may have produced the finest specimens of emerald, most of the emeralds to be mined out of the country are treated and oiled, or even fracture filled. The same goes for rubies and sapphires: most of them are heated to improve it's appearance (which is an accepted kind of treatment).\nWhen buying a gemstone (especially one of the 3 main ones, emerald, ruby and sapphire) it id highly recommendable to get well informed on the matter. No particular feature of the stone is a guarantee of the stone's value: a good color achieved by treatment, or impaired by many cracks and fractures will not make for a valuable stone. Also, it's important to be informed about what are the current gemstone treatments (which are legal, which not), and decievers; what are the more likely scams and so on. \nBuying a gemstone at the mine of origin is no guarantee, either: out of every 10 emeralds to be taken out of Columbia, 2 or 3 will have been switched for synthetic emeralds AT THE MINE. \nEven the most reputable jewelers have to carefully an
791444
I think the answer will depend on what you mean by "popular." If by popular you mean the most carats of gemstones sold commercially, then I think we would be looking at a less expensive gemstone such as amethyst or citrine (normally super-heated amethyst) or topaz in one of its many enhanced-color options.\n\nIf by popular you mean valuable, then emeralds and rubies are the most valuable monetarily. In fact, an emerald or ruby of equal size and quality are normally more valuable than their diamond counterparts.
271757
EMERALD\n\nThat's a gem of a poser!
598837
smthing unprecedented and rare!!\ngirl ur special.....
353876
If by "naturally occuring" you mean present in nature in its elemental form, then the answer includes noble gases (Helium and Argon), noble metals (Gold and Platinum and maybe Copper), and some diatomic molecules (Oxygen, Nitrogen) as well as Sulfur (S_8) and Carbon (graphite and diamond).  Most of the metals are found as some kind of oxide (in ores) or in salts (sodium chloride).  The halogens are found in salts (sodium chloride). \n\nA lot of today's useful materials were never present in significant amounts in elemental form, for example: iron, aluminum, zinc.
784096
Rare commodity anymore.\n\nhttp://blog.360.yahoo.com/blog-pOypG0szd7Pv_X1rQxw_4qCWpA--?cq=1&p=182
864116
1) is false, all the elements in living things can be found in non-living things\n\n2) this more tricky, what are these 4 elements most common in plants? I'm guessing: Hydrogen and Oxygen, (from water) Carbon, and . . .nitrogen???\nall these can be found in animals\nare you sure the question is asking about elements? elements in living things are pretty common to another. Its the compounds (hemoglobin, chlorophyll, etc) that get rather unique\n\ndo a little research, if some one cannot explain how they got the answer to a T/F question, you can't be sure they are just guessing
937327
dont know but very rare