Spinel - Wikipedia
网页Spinel (/ spɪˈnɛl, ˈspɪnəl / [7]) is the magnesium / aluminium member of the larger spinel group of minerals. It has the formula MgAl. 2O. 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5] Properties. Cut spinel.
Spinel group - Wikipedia
网页The spinels are any of a class of minerals of general formulation AB 2 X 4 which crystallise in the cubic (isometric) crystal system, with the X anions (typically chalcogens, like oxygen and sulfur) arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the octahedral and tetrahedral sites in the lattice.
Spinel Gemstone | Spinel Stone - GIA
网页Until recently, spinel was an underappreciated gem with little consumer recognition. Increasing demand for ruby alternatives rekindled appreciation for spinel’s rich red color and history. In ancient times, southeast Asia’s mines yielded exceptional large spinel crystals, which became the treasured property of kings and emperors, often ...
Spinel Gem, Price, and Jewelry Information - Gem Society
网页Spinels make ideal stones for any type of jewelry, including engagement rings and other pieces intended for daily wear. You will also find spinels usually have considerably lower prices than alexandrites, rubies, sapphires, and diamonds.
13 Gemmy Facts About Spinel - The Overlooked Gem - Geology.com
网页Spinel is a new birthstone with vivid colors that span the spectrum. It has a spectacular luster, excellent durability, and its current price might be at a low that you will never see again. Here are 13 reasons why I believe that spinel is one of …
Spinel Description - GIA
网页Spinel, like garnet and diamond, is singly refractive, with the same physical properties in all crystal directions. It belongs to the cubic crystal system, and its characteristic crystal shape is an octahedron, which looks like two back-to-back pyramids.
Spinel Gemstone | Spinel Stone - GIA
网页The most valued spinel colors are the vivid reds and cobalt blues that remind us why spinel was once confused with ruby and sapphire. Although the most commercially important colors are red and pink, mauve- or lilac-colored gems are also attractive, and some blue spinel colors can be very valuable.
Spinel | Gemstone, Hardness, Structure | Britannica
网页spinel, mineral composed of magnesium aluminum oxide (MgAl 2 O 4) or any member of a group of rock-forming minerals, all of which are metal oxides with the general composition AB2 O 4, in which A may be magnesium, iron, zinc, manganese, or nickel; B may be aluminum, chromium, or iron; and O is oxygen.
The spinel Mineral Series - The Mineral and Gemstone Kingdom
网页The spinel Mineral Series. Spinel occurs in almost every color, and forms gem s of all colors. It is not a well known gem, although good specimens can attain very high prices. Bright red Spinel, known as Ruby Spinel, is the most valuable Spinel.
Everything You Need to Know About the Spinel Gem - American Gem Society
网页2021年8月2日 · Long mined in Sri Lanka, Afghanistan, Myanmar, Vietnam, and Thailand, spinel garnered deep appreciation for its beauty, even winning a treasured place in a number of crown jewels. Found in a variety of colors, including red, blue, violet, and dark green, spinel gemstones are regaining their popularity of old.