Spinel (/ spɪˈnɛl, ˈspɪnəl / [7]) is the magnesium / aluminium member of the larger spinel group of minerals. It has the formula MgAl. 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]

Aug 24, 2023 · Spinel is a mineral that belongs to the group of oxides and forms in various colors, making it a popular gemstone. Its chemical composition is magnesium aluminum oxide (MgAl2O4). Spinel crystals have an octahedral crystal structure and are often found as octahedral, rounded grains or as single crystals.

Spinel is an oxide mineral with a composition of MgAl 2 O 4 and an isometric crystal structure. It is often found in octahedral crystals. It has a Mohs hardness of 8, a high tenacity, and a specific gravity between 3.5 and 3.61.

The mineral spinel MgAl 2 O 4 has a normal spinel structure. In a normal spinel structure, the ions are in the following positions, where i, j, and k are arbitrary integers and δ, ε, and ζ are small real numbers (note that the unit cell can be chosen differently, giving different coordinates): [16]

Detailed description, properties, and locality information guide about the mineral spinel: including ruby spinel, gahnite, galaxite, and hercynite.

Spinel belongs to the cubic crystal system and its characteristic crystal shape is an octahedron, which looks like two back-to-back pyramids. Like ruby, spinel is found in alluvial deposits; it ranks 8 on the Mohs scale and has good toughness, making it a durable gem for jewelry.

The name spinel has commonly been used in petrological literature as a synonym for any spinel group minerals, especially in igneous rocks. Usually red due to trace chromium. Other coloured to black varieties are due to the incorporation of higher …

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 the world's most overlooked gems. The Most Overlooked Gem?

Spinel, mineral composed of magnesium aluminum oxide (MgAl2O4) or any member of a group of rock-forming minerals, all of which are metal oxides with the general composition AB2O4, in which A may be magnesium, iron, zinc, manganese, or nickel; B may be aluminum, chromium, or iron; and O is oxygen.

Metamorphic mineral found in limestone and dolomite marbles and very-low silica and alkali igneous rocks (e.g. peridotites). IMA Status: Valid Species (Pre-IMA) 1546