molybdofornacite vs aerugite

molybdofornacite (mineral) | aerugite (mineral)

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| molybdofornacite | aerugite formula | Pb_2Cu[(As, P)O_4][(Mo, Cr)O_4](OH) | ([], Ni)_9(AsO_4)_2(AsO_6) discovery year | | 1858

| molybdofornacite | aerugite density | 6.6 g/cm^3 | 5.9 g/cm^3 transparency | transparent | opaque birefringence | 0.1 | luster | adamantine | adamantine Mohs hardness | 5/2 | 4 streak | yellow | greenish white magnetism | nonmagnetic | nonmagnetic color | light green | deep blue green | green fracture | conchoidal | molar mass | 790.1 g/mol | 977 g/mol

| molybdofornacite | aerugite Strunz ID | VI/F.02-30 | VII/B.09-10 Dana ID | 43.4.3.3 | 38.5.10.1 IMA number | IMA1982-062 | ICSD number | | ICSD65630

| molybdofornacite | aerugite crystal system | monoclinic | trigonal crystal class | 2/m | -32/m unit cell volume | 807.7 Å^3 (cubic ångströms) | 845.5 Å^3 (cubic ångströms) d-spacing | 3.32 Å (ångströms) | 2.845 Å (ångströms) | 2.979 Å (ångströms) | 2.06 Å (ångströms) | 3.76 Å (ångströms) | 2.329 Å (ångströms) intensity | 100% | 60% | 60% | 100% | 80% | 60% molecules per unit cell | 4 molecules per cell | 3 molecules per cell refractive indices | 2.05 | 0 | 0 | 0 | 0 | 0 | dispersion | r < v | strong | unit cell lengths | 8.1 Å (ångströms) | 5.946 Å (ångströms) | 17.65 Å (ångströms) | 5.951 Å (ångströms) | 27.57 Å (ångströms) | 27.57 Å (ångströms) unit cell angles | 90° (degrees) | 108.2° (degrees) | 90° (degrees) | 90° (degrees) | 90° (degrees) | 120° (degrees)

Aerugite is a rare complex nickel arsenate mineral with a variably reported formula: Ni_9(AsO_4)_2AsO_6. It forms green to deep blue-green trigonal crystals. It has a Mohs hardness of 4 and a specific gravity of 5.85 to 5.95.