aluminite
Sign in to saveAluminite is a hydrous aluminium sulfate mineral with formula: Al2SO4(OH)4·7H2O. 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. thumb|left|An outcrop of aluminite at the top of the white chalk of the cliff at Newhaven, East Sussex, England.
Key facts
- Mineral.name
- Aluminite
- Mineral.category
- Sulfate mineral
- Mineral.image
- Aluminite - Newhaven, Sussex, England.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Aluminite from Newhaven, Sussex, England
- Mineral.formula
- Al2SO4(OH)4·7H2O
- Mineral.IMAsymbol
- A
- Mineral.strunz
- 7.DC.05
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P21/c
- Mineral.unit cell
- a = 7.44, b = 15.583 c = 11.7 [Å]; β = 110.18°; Z = 4
- Mineral.color
- White to grayish white
- Mineral.habit
- Needles and fibrous masses
- Mineral.cleavage
- None
- Mineral.fracture
- Irregular/uneven
- Mineral.tenacity
- Friable
- Mineral.mohs
- 1 - 2
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Aluminite is a hydrous aluminium sulfate mineral with formula: Al2SO4(OH)4·7H2O. 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. thumb|left|An outcrop of aluminite at the top of the white chalk of the cliff at Newhaven, East Sussex, England.
It forms in clay and lignite deposits as an oxidation product of pyrite and marcasite along with aluminium silicates. It also occurs in volcanic sublimates, in native sulfur deposits and rarely in caves. It occurs in association with basaluminite, gibbsite, epsomite, gypsum, celestine, dolomite and goethite.