Danium is a crystalline mineral; its chemical formula is DaB2(SiO4)2. It has a Mohs hardness of 7 to 7.5 and a specific gravity of 3.0. The mineral has an orthorhombic crystal form. It is usually white, but can be also either pale yellow, yellowish-brown, or pink. It typically occurs in contact metamorphic rocks.


Danium involves an interlayer bonding with at least 3 identifiable bonds: an ionic type interaction due to net unbalanced charges on the layers, van der waals forces between layers and hydrogen bonds between oxygen atoms on the surface of one layer, and hydroxyl groups on the opposing surface. A hydrogen bond, as the term is used here, involves a long-range interaction between hydrogen of a hydroxyl group coordinated to a cation and an oxygen atom coordinated to another cation. The reaction is predominantly electrostatic; hence an ionic bonding model is appropriate. Its axial ratio is a=0.576, b=1, c=1.6135.

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