Input interpretation
buddingtonite (mineral)
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General properties
formula | (NH_4)AlSi_3O_8·0.5(H_2O) discovery year | 1964
Basic properties
density | 2.32 g/cm^3 transparency | transparent | translucent birefringence | 0.004 luster | vitreous Mohs hardness | 5.5 streak | white magnetism | nonmagnetic color | colorless | white fracture | brittle | conchoidal molar mass | 266.3 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | VIII/J.06-10 Dana ID | 76.1.2.1 IMA number | IMA1963-001
Crystallographic properties
crystal system | monoclinic crystal class | 2 | 2/m unit cell volume | 740.6 Å^3 (cubic ångströms) d-spacing | 3.81 Å (ångströms) | 6.52 Å (ångströms) | 3.381 Å (ångströms) intensity | 100% | 96% | 72% molecules per unit cell | 4 molecules per cell refractive indices | 1.53 | 0 | 0 | 0 | 0 | 0 dispersion | weak unit cell lengths | 8.571 Å (ångströms) | 13.03 Å (ångströms) | 7.187 Å (ångströms) unit cell angles | 90° (degrees) | 112.7° (degrees) | 90° (degrees)
Wikipedia summary
Buddingtonite is an ammonium feldspar with formula: NH_4AlSi_3O_8 (note: some sources add 0.5H_2O to the formula). It forms by hydrothermal alteration of primary feldspar minerals. It is an indicator of possible gold and silver deposits, as they can become concentrated by hydrothermal processes. It crystallizes in the monoclinic crystal system and is colorless to white with a vitreous luster. Its structure is analogous to that of high sanidine (KAlSi_3O_8). Buddingtonite has a hardness of 5.5 and a specific gravity of 2.32.