What is the most rarest rock of mineral on earth?
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A mineral is a naturally occurring, inorganic solid with a definite chemical composition and a crystalline structure. A rock is an aggregate of one or more minerals. (A rock may also include organic remains.) Some rocks are predominantly composed of just one mineral. For example, limestone is a sedimentary rock composed almost entirely of the mineral calcite. Other rocks contain many minerals, and the specific minerals in a rock can vary widely. Some minerals, like quartz, mica or feldspar are common, while others have been found in only one or two locations worldwide. Over half of the mineral species known are so rare that they have only been found in a handful of samples, and many are known from only one or two small grains.\nthere for its hard to say which is rarest.
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A Corundum Ruby cause it's #9 om the hardness scale of minerals right under diamonds #10.
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Feldspar is the name of an important group of rock-forming minerals which make up perhaps as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks; they occur as compact minerals, as veins, and are also present in many types of metamorphic rock. Rock formed entirely of plagioclase feldspar (see below) is known as anorthosite. Feldspars are also found in many types of sedimentary rock.\n\nThis group of minerals consists of framework or tectosilicates:\n\n- orthoclase a potassium-aluminium silicate,\n- microcline also a potassium-aluminium silicate, and\n- plagioclase a sodium-aluminium silicate to a calcium-aluminium silicate isomorphous series:\n          o albite\n          o oligoclase\n          o andesine\n          o labradorite\n          o bytownite\n          o anorthite.
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The only renewable mineral deposit that I saw I was in Andes (it was called 'salar '). The miners work this mine periodically (harvest), therefore it had thermal sources. This sources , deposit (all the time)  thermal waters, with same kind of minerals solved in it.\n\nRenewable mineral resources on to other planets? I don't know!
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Osmium is densest followed by Irridium\nOs\nOsmium is the densest element known and the hardest of all platinum\ngroup metals (PGMs). It is 10 times harder than platinum itself.\nOsmium also has a higher melting point than the other PGMs.\nP r o p e r t i e s\nElectrical conductivity 0.109 106 cm-1 Ohm-1\nDensity 22.61 g/cc\nHardness (Brinell value) 3920 MN m-2\nMelting point 3050 ºC\nRarity 1x10-4 ppm in lithosphere\nAtomic number 76\nAtomic weight 190.23\nElectrical resistivity 8.12 microhm.cm at 0°C\nThermal conductivity 87 watts/metre/°C\n\nHeaviest element I think is Francium\nFrancium is a chemical element in the periodic table that has the symbol Fr and atomic number 87. This is a highly radioactive alkali metal that is found in uranium and thorium ores. \nThis element, which was named for France, was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris. Francium is the heaviest alkali metal and occurs as a result of actinium's alpha decay and can be artificially made by bombarding thorium with protons. \n\nEven though it naturally occurs in uranium minerals, it has been estimated that there might be less than 30 grams of francium in the crust of the earth at any one time. It is the most unstable element among the first 101 and has the highest equivalent weight of any element. \n\nThere are 41 known isotopes of francium. With a 22 minute half life, the longest lived isotope of this element is 223Fr which is a daughter isotope of 227At and is the only isotope of francium that occurs naturally. All known isotopes of francium are highly unstable, therefore knowledge of the properties of this element only comes from radiochemical procedures. \n\nA small number of pictures of francium have been taken but only of at the most 200,000 atoms at a time. The pictures were taken by trapping the atoms and using a special fluorescent imaging camera.
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Answering the question would be easier if I knew which type of mineral you were looking for.  Try looking on this link:\n\nhttp://www.rockhounds.com/rockshop/table.shtml\n\nIf you are looking to purchase, there are many people willing to take your money.  For information and more reasonable prices, there are rockshops (non new age) sprinkled through out the country, and the 2 best gems shows are in Denver & Tuscon.\n\nThe next issue is size.  In different mineral species, different sizes are considered large.  For example, quartz crystals up to the size of a gallon jug are found in Mt Ida, AK while selenites have been found in Mexico up to 20 ft tall (note that these are single crystals, not undifferentiated masses).  The largest rhodocrosite is about 6.5 inches per face (in the Denver Natural History Museum), the largest calcite is around 2 foot long (Shifferdecker Museum in Joplin, Mo).  With my friends, I have found a 14" double terminated calcite in Okhlahoma, and a nearly 2 foot selenite in Kansas.\n\nSolution minerals are more typically accessable when compared  with igneous ones, but all the hugest crystals are of igneous origin.  Most of the world record holders are so big thay can never be moved from the mine, unless destroyed.\nIf you seek mineral materiel without reference to single crystals, rough is available in masses shipped in either oil barrels or box cars, usually for industry or amature lapidary work.\n\nIf you are seeking gem materiel, it is unlikely that you can find it for a price within reason, even the synthetics. \n\nIf you are seeking geodes, the warsaw shale is the place to look.  It extends through out the midwest.\n\nThere are groups of rockhounds all over, and we go forth to find exactly what you are seeking.  However, there is actual physical labor involved, and possibly travel costs.  You might consider also speaking a professor with the local college in your area.
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Uranium is a naturally occurring element found in low levels within all rock, soil, and water. This is the highest-numbered element to be found naturally in significant quantities on earth.\n\nIt is considered to be more plentiful than antimony, beryllium, cadmium, gold, mercury, silver, or tungsten and is about as abundant as arsenic or molybdenum. It is found in many minerals including uraninite (also called pitchblende, most common uranium ore), autunite, uranophane, torbernite, and coffinite. Significant concentrations of uranium occur in some substances such as phosphate rock deposits, and minerals such as lignite, and monazite sands in uranium-rich ores (it is recovered commercially from these sources).\n\nUranium is found to some extent in the majority of rocks and sediments making up the Earth's crust, but is never found in concentrated deposits. \n\nThe most common uranium ore is pitchblende, which consists of a mixture of UO2 with U3O8. The largest known source of pitchblende is located in the Leopolville mines, in Congo, Africa. \n\nOther uranium containing minerals are euxenite, carnotite, brannerite and coffinite. The largest deposits of these ores are located in the USA, Canada, Russia and France.
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Diamond is the hardest known naturally occurring material, scoring 10 on the relative Mohs scale of mineral hardness and having an absolute hardness value of between 167 and 231 gigapascals in various tests. Diamond's hardness has been known since antiquity, and is the source of its name. However, aggregated diamond nanorods, an allotrope of carbon first synthesized in 2005, are now believed to be even harder than diamond.
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Coal, iron ore, copper, chromium, antimony, mercury, gold, barite, borate, celestite (strontium), emery, feldspar, limestone, magnesite, marble, perlite, pumice, pyrites (sulfur), clay, arable land, and hydropower.
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Peridot (pronounced "pear-uh-dot" or "pear-uh-doe", IPA: /pɛɹɪdɑːt/ or Fr. /peʁido/) is the gem quality variety of forsteritic olivine. The chemical composition of peridot is (Mg, Fe)2SiO4, with Mg in greater quantities than Fe. The name of the gemstone is believed to come from either the Arabic word faridat meaning "gem" or the French word peritot meaning "unclear." Peridot is one of the few gemstones that comes in only one color. The depth of green depends on how much iron is contained in the crystal structure, and varies from yellow-green to olive to brownish green. Peridot is also often referred to as "poor man's emerald". Olivine is a very abundant mineral, but gem-quality peridot is rather rare. Peridot crystals have been collected from iron-nickel meteorites.
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Minerals are the building blocks of rocks.  For example, feldspar and quartz are minerals, but they can combine (along with other minerals) to make the rock granite.
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1) flint is a form of quartz, or glass, that is among the hardest minerals due to its molecular structure. When two equally hard objects are sruck together a spark occurs as residual bond energy is released from that strong molecular structure.\n\n2) Fred and Wilma spark when they kiss sometimes, unless Fred has already given it to Barney the purple dinosaur.
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Most Common Element\nHydrogen is the most common element in both the Universe and the Solar System. Over 90% of the Universe is comprised of hydrogen. -----Iron is the most common element on Earth,----- accounting for 36% of its mass.
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Si is the most abundant mineral element, but feldspar would be the most abundant mineral as far as rocks & minerals. Quartz comes in second.
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It depends on if you are looking at large quanities or just any ammount goes. It also depends on if you are looking at elements that are only found in compounds or not. Oxygen, hydrogen, argon, carbon, nitrogen, alluminium, silicon, iron, tugstan, lithium, potassum, titanium to name a few. almost all of the elements can be found near the earth's surface except those that are man made, usually the extremly heavy ones like plutonium.
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I don't know what a proper mineral is...but I'll tell you what I like...\n\nDIAMOND: it's pure carbon, it is transparent as water...and I LOVE WATER.\n\nGOLD: I like its brightness and colour...and it reminds me of the Olympics, and of my sporting heroes...\n\nEMERALD: I love its green colour.\n\nOPAL: it's an Australian material, not as precious as gold...but it has a wonderful combination of colours. It is amazing.\n\nAQUAMARINE: I love its colour and purity, and it reminds me of the OCEAN.
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The value of stones depends on their rarity and esthetical value, not so much on their age. \nSecondly not all stones are as old as the earth. The earth's continental crust is continuasly renewed. New crust forms at mid ocean rifs and wells up in vulcanoes. And crust disappears when one continent al slab slips under another.