Garnet is a generic formula X3Y2 (SiO4) 3, silicate minerals (Silicate_minerals). X where normally bivalent (divalent) of positive ions (Ca, Mg, Fe) occupy, and Y is where is a trivalent cation (Al, Fe, Cr) to occupy, with a regular octahedron or the [SiO4] provided tetrahedral framework. Garnet crystal dodecahedron habit (crystal habit) most commonly found, but black silicon carbide there is also a common habit recipe black silicon carbide three octahedral (trapezohedron) (note here the "recipe three octahedral" in the main mineral literature will be called kite-shaped three-dimensional geometry THH (Deltoidal icositetrahedron)). They crystallize in the isometric crystal system, there are three equal-length axis and perpendicular to each other. Garnet and will not appear cleavage (Cleavage), so when they burst under pressure will produce steel fiber for concrete reinforcement significant irregular pieces, powerful energy natural crystal can bring unlimited inspiration and vitality.
On the market so-called "green garnet Bi" and garnet nothing to do, in fact, prehnite. Prehnite not green garnet, two completely different concepts. The grapes on white aluminum oxide the market take the side of the stone and green garnet, is nothing more than for financial gain. Value Demantoid very expensive diamond bid, the market is extremely rare.
Hardness
Because different types of garnet chemical composition varies greatly, some kind of atomic bond strength than the other. Therefore, these minerals group will demonstrate a range of hardness ranging from about 6.5 to 7.5 Mohs hardness. Among the harder species such as almandine garnet is often used as abrasive purposes.
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