Gibbsite
Al(OH)₃
Oxides
Hardness —
· Monoclinic
Photo: Bauhaus-Universität Weimar · CC BY-SA 3.0
Ettringite
Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O
Hydrated calcium sulfo-aluminate
Properties
- Chemical formula
- Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O
- Group
- Oxides
- Crystal system
- Trigonal
- Hardness (Mohs)
- —
- Color
- Colorless
- Luster
- —
- Streak
- White
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- —
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 7.DG.15
- Dana classification
- 31.10.2.1
- IMA status
- Approved mineral and/or valid name (A)
- IMA symbol
- Ett
- Locality
- 🇩🇪 Bellerberg volcano
- Type locality
- —
- Discovery year
- —
Etymology
Named after Ettringen
Source: Wikidata
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