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aluminite

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aluminite (mineral)
aluminite (mineral)

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General properties

alternate names | alley stone | native argill | websterite formula | Al_2(SO_4)(OH)_4·7(H_2O) discovery year | 1807
alternate names | alley stone | native argill | websterite formula | Al_2(SO_4)(OH)_4·7(H_2O) discovery year | 1807

Basic properties

density | 1.68 g/cm^3 transparency | opaque birefringence | 0.011 luster | earthy Mohs hardness | 3/2 = 1.5 tenacity | fragile streak | white magnetism | nonmagnetic color | white | grayish white fracture | earthy molar mass | 344.2 g/mol (grams per mole)
density | 1.68 g/cm^3 transparency | opaque birefringence | 0.011 luster | earthy Mohs hardness | 3/2 = 1.5 tenacity | fragile streak | white magnetism | nonmagnetic color | white | grayish white fracture | earthy molar mass | 344.2 g/mol (grams per mole)

Units

Mineral identifiers

Strunz ID | VI/D.06-40 Dana ID | 31.7.4.1 ICSD number | ICSD2234
Strunz ID | VI/D.06-40 Dana ID | 31.7.4.1 ICSD number | ICSD2234

Crystallographic properties

crystal system | monoclinic crystal class | 2/m unit cell volume | 1273 Å^3 (cubic ångströms) d-spacing | 8.977 Å (ångströms) | 7.791 Å (ångströms) | 4.696 Å (ångströms) intensity | 100% | 87% | 48% molecules per unit cell | 4 molecules per cell 2V angle | 22 π/45 radians≈88° (degrees) refractive indices | 1.459 | 0 | 0 | 0 | 0 | 0 dispersion | none unit cell lengths | 7.44 Å (ångströms) | 15.58 Å (ångströms) | 11.7 Å (ångströms) unit cell angles | 90° (degrees) | 110.2° (degrees) | 90° (degrees)
crystal system | monoclinic crystal class | 2/m unit cell volume | 1273 Å^3 (cubic ångströms) d-spacing | 8.977 Å (ångströms) | 7.791 Å (ångströms) | 4.696 Å (ångströms) intensity | 100% | 87% | 48% molecules per unit cell | 4 molecules per cell 2V angle | 22 π/45 radians≈88° (degrees) refractive indices | 1.459 | 0 | 0 | 0 | 0 | 0 dispersion | none unit cell lengths | 7.44 Å (ångströms) | 15.58 Å (ångströms) | 11.7 Å (ångströms) unit cell angles | 90° (degrees) | 110.2° (degrees) | 90° (degrees)

Wikipedia summary

Aluminite is a hydrous aluminium sulfate mineral with formula: Al_2SO_4(OH)_4·7H_2O. It is an earthy white to gray-white monoclinic mineral which almost never exhibits crystal form. It forms botryoidal to mammillary clay-like masses. It has a very soft Mohs hardness of 1-2 and a specific gravity of 1.66-1.82.
Aluminite is a hydrous aluminium sulfate mineral with formula: Al_2SO_4(OH)_4·7H_2O. It is an earthy white to gray-white monoclinic mineral which almost never exhibits crystal form. It forms botryoidal to mammillary clay-like masses. It has a very soft Mohs hardness of 1-2 and a specific gravity of 1.66-1.82.