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garnet
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garnet The structure of garnet. This schematic diagram of part of the garnet structure shows the distorted silicon-oxygen tetrahedrons and BO6 octahedrons and the distorted cubes with central A cations. Dodecahedron, a common crystal form of garnet. Trapezohedron, a common crystal form of garnet. Dodecahedron-trapezohedron combination, a common crystal form of garnet. photomicrograph of corroded garnet ring Garnet paragonite Figure 15: Schematic cross section illustrating the shell structure of the Earth.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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garnet
garnet Garnet in schist.

garnet

mineral
Written by
R.V. Dietrich
Emeritus Professor of Geology, Central Michigan University, Mount Pleasant. Author of Stones; coauthor of Gems, Gravels and Granites.
R.V. Dietrich
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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garnet, any member of a group of common silicate minerals that have similar crystal structures and chemical compositions. They may be colourless, black, and many shades of red and green. Garnets, favoured by lapidaries since ancient times and used widely as an abrasive, occur in rocks of each of the major classes. In most rocks, however, garnets occur in only minor amounts—i.e., they are accessory minerals. Nevertheless, as a consequence of their distinctive appearances, they...

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