Input interpretation
adamite (mineral)
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General properties
formula | Zn_2(AsO_4)(OH) discovery year | 1866
Basic properties
density | 4.4 g/cm^3 transparency | subtransparent birefringence | 0.053 luster | vitreous Mohs hardness | 3.5 tenacity | brittle streak | white magnetism | nonmagnetic color | yellow | green | violet | pink | yellowish green fracture | brittle molar mass | 286.7 g/mol (grams per mole)
Units
Mineral identifiers
Strunz ID | VII/B.06-30 Dana ID | 41.6.6.3 ICSD number | ICSD34868
Crystallographic properties
crystal system | orthorhombic crystal class | 2/m2/m2/m unit cell volume | 427.8 Å^3 (cubic ångströms) d-spacing | 2.45 Å (ångströms) | 2.97 Å (ångströms) | 4.9 Å (ångströms) intensity | 100% | 90% | 90% molecules per unit cell | 4 molecules per cell 2V angle | 9 π/20 radians≈81° (degrees) refractive indices | 1.715 | 1.743 | 1.768 | 0 | 0 | 0 dispersion | none unit cell lengths | 8.306 Å (ångströms) | 8.524 Å (ångströms) | 6.043 Å (ångströms) unit cell angles | 90° (degrees) | 90° (degrees) | 90° (degrees)
Wikipedia summary
Adamite is a zinc arsenate hydroxide mineral, Zn_2AsO_4OH. It is a mineral that typically occurs in the oxidized or weathered zone above zinc ore occurrences. Pure adamite is colorless, but usually it possess yellow color due to Fe compounds admixture. Tints of green also occur and are connected with copper substitutions in the mineral structure. Olivenite is a copper arsenate that is isostructural with adamite and there is considerable substitution between zinc and copper resulting in an intermediate called cuproadamite. Zincolivenite is a recently discovered mineral being an intermediate mineral with formula CuZn(AsO_4)(OH). Manganese, cobalt, and nickel also substitute in the structure. An analogous zinc phosphate, tarbuttite, is known.