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In nature, gold most often occurs in its native state (that is, as a metal), though usually alloyed with silver. Native gold contains usually eight to ten percent silver, but often much more - alloys with a silver content over 20% are called electrum. As the amount of silver increases, the color becomes whiter and the specific gravity becomes lower. Ores bearing native gold consist of grains or microscopic particles of metallic gold embedded in rock, often in association with veins of quartz or sulfide minerals like pyrite. These are called "lode" deposits. Native gold is also found in the form of free flakes, grains or larger nuggets that have been eroded from rocks and end up in alluvial deposits (called placer deposits). Such free gold is always richer at the surface of gold-bearing veins owing to the oxidation of accompanying minerals followed by weathering, and washing of the dust into streams and rivers, where it collects and can be welded by water action to form nuggets. Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite, and as the rare bismuthide maldonite (Au2Bi) and antimonide aurostibite (AuSb2). Gold also occurs in rare alloys with copper, lead, and Mercury: the minerals auricupride (Cu3Au), novodneprite (AuPb3) and weishanite ((Au,Ag)3Hg2).
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Where are the most valuable minerals found?
water and every thing you eat or drink because ot contains water even purified water has minerals but the most comman is salt
Where is the element magnesium found in the world?
It is found in large deposits in the form of magnesite, dolomite, and other minerals.
What minerals are found in sand?
Sand is not any particular mineral, it is a grain size. Different sands can include quartz, feldspar, calcite and a variety of other minerals.
What metals contain steel?
The main element in steel is usually iron. It also contains small amounts of other substances, to improve its properties. Often it contains some carbon (not a metal), and sometimes smaller amounts of other metals.
What does a rock and mineral have in common with each other?
Rock and minerals are both considered to be natural substances and this is what they have in common.
Where can minerals found?
Minerals can be found everywhere, you may not even realize how close we come to facing minerals every day. your makeup contains minerals, batteries have the mineral nickel. your pencil contains graphite and clay, two other examples of minerals. Believe it or not your toothpaste contains florite, another common mineral.
How do garnets occur?
Garnet is a type of mineral that is found in nature. It is often mined from underground caves, like other minerals and metals.
What are Adjacent Minerals?
Minerals found next to each other are called adjacent.
How is beryllium separated from other minerals found with it?
NO
What are the cohesive and cohesionless soils and how thr are differe from each other?
Cohesive soil contains high clay minerals whereas cohesionless contains less clay minerals. source:engineeringmad.com
Why are nickel and copper often found together?
Nickel and Copper are often found together because nickel and copper have the same densities so when they are layered together between other minerals, they layer into one category
Does milk contain starch?
it contains protein,calcium,fat and other minerals
How are minerals found?
Minerals are elements and compounds. The crystals that make up rocks are minerals. Minerals are found in ore, soil, and dissolved in water. All living organisms contain minerals. Any non-organic rock is composed of minerals.
How aer fooks and miinerals?
Minerals are found in many food sources. Minerals such as calcium are found in dairy products such as yogurt and milk. Other minerals such as Magnesium are found in green vegetables, almonds and nuts.
How is silver found?
Silver is found as free metal, or in minerals of other metals.
Are other gems found near quartz deposits?
Many other minerals are found in association with quartz.
What are the physical properties of rocks?
Pegmatite is a light-colored, extremely coarse-grained intrusive igneous rock. It forms near the margins of a magma chamber during the final phases of magma chamber crystallization. It often contains rare minerals that are not found in other parts of the magma chamber.
