alunogen
Sign in to saveAlunogen (from French alun, "alum"), also called feather alum and hair salt is a colourless to white (although often coloured by impurities, such as iron substituting for aluminium) fibrous to needle-like aluminium sulfate mineral. It has the chemical formula Al2(SO4)3·17H2O.
Key facts
- Mineral.name
- Alunogen
- Mineral.image
- Alunogen - Almyras, Agia Varvara, Cyprus.jpg
- Mineral.caption
- Alunogen
- Mineral.category
- Sulfate minerals
- Mineral.formula
- Al2(SO4)3·17H2O
- Mineral.IMAsymbol
- Alg
- Mineral.strunz
- 7.CB.45
- Mineral.system
- Triclinic
- Mineral.class
- Pinacoidal () (same H-M symbol)
- Mineral.symmetry
- P
- Mineral.unit cell
- a = 7.42, b = 26.97 c = 6.062 [Å]; α = 89.95° β = 97.566°, γ = 91.888°; Z = 2
- Mineral.colour
- Colourless; white, pale yellow to red from impurities
- Mineral.habit
- Platy to prismatic crystals rare, fibrous masses, crusts, and efflorescences
- Mineral.twinning
- On
- Mineral.cleavage
- Perfect on , probable on and
- Mineral.fracture
- Subconchoidal
- Mineral.mohs
- 1.5–2
- Mineral.lustre
- Vitreous to silky
via Wikipedia infobox
Wikidata facts
- Image
- Alunogen - Almyras, Agia Varvara, Cyprus.jpg
Show 6 more facts
- Strunz 8th edition (series ID, updated)
- VI/C.04
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.CB.45
- IMA Mineral Symbol
- Alg
- chemical formula
- Al₂(SO₄)₃(H₂O)₁₂·5H₂O
- Nickel-Strunz 9th edition (updated 2009)
- 7.CB.45
- Commons category
- Alunogen
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Article
1 sectionsContents
- References
Alunogen (from French alun, "alum"), also called feather alum and hair salt is a colourless to white (although often coloured by impurities, such as iron substituting for aluminium) fibrous to needle-like aluminium sulfate mineral. It has the chemical formula Al2(SO4)3·17H2O.
It is often found on the walls of mines and quarries as a secondary mineral. It can be found in the oxidation zones of some ore deposits as well as on burning coal dumps (i.e., as the product of millosevichite hydration). It also forms as a low temperature deposit in fumaroles. It occurs associated with pyrite, marcasite, halotrichite, pickeringite, epsomite, potash alum, melanterite and gypsum.