Input interpretation
adamite (mineral) | spencerite (mineral)
Images
Images
General properties
| adamite | spencerite formula | Zn_2(AsO_4)(OH) | Zn_4(PO_4)_2(OH)_2·3(H_2O) discovery year | 1866 | 1916
Basic properties
| adamite | spencerite density | 4.4 g/cm^3 | 3.12 g/cm^3 transparency | subtransparent | transparent | translucent birefringence | 0.053 | 0.02 luster | vitreous | vitreous | pearly Mohs hardness | 3.5 | 3 tenacity | brittle | streak | white | white magnetism | nonmagnetic | nonmagnetic color | yellow | green | violet | pink | yellowish green | white fracture | brittle | molar mass | 286.7 g/mol | 539.6 g/mol
Units
Mineral identifiers
| adamite | spencerite Strunz ID | VII/B.06-30 | VII/D.07-60 Dana ID | 41.6.6.3 | 42.6.4.2 ICSD number | ICSD34868 | ICSD9349
Crystallographic properties
| adamite | spencerite crystal system | orthorhombic | monoclinic crystal class | 2/m2/m2/m | 2/m unit cell volume | 427.8 Å^3 (cubic ångströms) | 550.8 Å^3 (cubic ångströms) d-spacing | 2.45 Å (ångströms) | 2.97 Å (ångströms) | 4.9 Å (ångströms) | 9.4 Å (ångströms) | 3.501 Å (ångströms) | 2.332 Å (ångströms) intensity | 100% | 90% | 90% | 100% | 55% | 30% molecules per unit cell | 4 molecules per cell | 2 molecules per cell 2V angle | 9 π/20 radians≈81° (degrees) | 49 π/180 radians≈49° (degrees) refractive indices | 1.715 | 1.743 | 1.768 | 0 | 0 | 0 | 1.586 | 0 | 0 | 0 | 0 | 0 dispersion | none | weak unit cell lengths | 8.306 Å (ångströms) | 8.524 Å (ångströms) | 6.043 Å (ångströms) | 10.44 Å (ångströms) | 5.28 Å (ångströms) | 11.2 Å (ångströms) unit cell angles | 90° (degrees) | 90° (degrees) | 90° (degrees) | 90° (degrees) | 116.8° (degrees) | 90° (degrees)
Wikipedia summary
Adamite
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.