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***Pure corundum is transparent and colorless but most specimens contain some transition elements substituting for aluminum, resulting in the presence of color. Substitution of Chromium results in a deep red color; such red corundum is known as ruby.
corundum is a dark red, blue and yellow colors
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∙ 14y ago
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Is corundum magnetic?
Small traces of iron are responsible for much of the color found in corundum (saphire) gems. Ruby, however, does not contain iron and will not be affected by a magnet. To be technical however, I should point out that corundum is not magnetic. Corundum will not attract other pieces of iron to itself (as far as I know). To simply answer that corundum is not magnetic would have been misleading.
Sapphires and rubies are both forms of the mineral corundum but they are different colors.Why?
Most corundum occurs as white, gray, dull blue or dull red crystals. However, a very small amount of corundum has a transparency, purity and color that make it suitable for use as a gemstone. These colorful corundums are among the most popular and valuable gems. Some gem-quality corundum is contaminated with trace amounts of chromium. A very small amount of chromium gives corundum a pink color and larger amounts produces stones that are deep red. These deep red corundums are known as "rubies". Transparent rubies are cut into faceted stones and translucent rubies are cut into cabochon-shaped gemstones. == Corundum that is contaminated with iron or titanium has a blue color. Deep blue corundums are known as "sapphires". When used alone, the word "sapphire" always refers to a deep blue corundum. Gem quality corundum occurs in a wide range of colors, including pink, pale blue, yellow and green. These stones are also known as "sapphires", however, when the color of a sapphire is any color other than deep blue the color of the stone is always used as an preceding adjective. For example: pink sapphire, yellow sapphire, green sapphire. Used alone, the word "sapphire" refers to the deep blue corundum. The color of corundum can be artificially altered by heating or radiation. Sometimes cloudy or translucent stones can be heated to yield brighter color or more transparent stones. When these color treatments are done the stone is supposed to be labeled as "heat treated" when it is presented for sale.
Why is corundum magnetic?
Corundum is not magnetic.
What is ruby streak color?
a maroon color with rotten white
Where was corundum discovered?
Corundum is found on all continents particularly in Burma (modern day Myanmar), South Africa, Canada, The Ural Mountains in Western Russia, and the United States. The biggest deposit was found in Sri Lanka. Corundum, which is also called "ruby" when red and "sapphire" when any other color, has been known since prehistoric times.
What are facts about the mineral corundum?
Pure corundum is clear in color.
What are the varieties of Corundum?
Corundum comes in just about every color of the rainbow. Every color but red is considered sapphire. Red corundum is the mineral that forms rubies.
What is the color of corundum?
Corundum has no streak color. Because of being a clear white or light blue, its streak is actually clear.
What color is the streak of corundum?
Corundum has no streak color. Because of being a clear white or light blue, its streak is actually clear.
What is ruby made of?
Rubies are a variety of corundum, the mineral name for aluminum oxide, Al2O3. The red color comes from trace amounts of chromium.
What are rubies made of?
Rubies are made of corundum (aluminum oxide, Al2O3) with trace impurities that give them their color.
What is the scientific name for a ruby?
The scientific name for a ruby is corundum. Rubies are a variety of the mineral corundum that get their red color from trace amounts of chromium present in the crystal structure.
What is the substance of sapphires?
Sapphires are the gemstone version of the mineral corundum. Sapphires come in every color except red corundum which are considered rubies.
What countries is corundum found in?
Corundum is the mineral form of sapphires and rubies. It comes in every color of the rainbow. Red corundum is a ruby. Every other color is considered sapphire. Corundum is found all over the world from Africa to Asia to the United States but some of the most beautiful are found in Sri Lanka. You will often see these referred to as Ceylon Sapphires or Rubies.
What is a mineral class?
Rubies are a color variant of the mineral corundum, which is an oxide.
What is the relation between rubies and sapphires?
Rubies and sapphires are both gem-quality variants of the same mineral: corundum. The only difference is in color. Red or pink corundum is ruby. Corundum in other colors is sapphire.
What are sapphires formed from?
Sapphires are formed when heat and pressure are applied to the mineral corundum. A sapphire can be any color but red. Impurities introduced in to the corundum during crystal formation dictate the final gemstone color.
