jennite

Also known as IMA1965-021

Jennite is a calcium silicate hydrate mineral of general chemical formula: Ca9Si6O18(OH)6·8H2O.

Key facts

Mineral.name: Jennite
Mineral.category: Silicate mineral
Mineral.image: Jennite_CSH_3D_Crystal_Structure_RasMol.gif
Mineral.imagesize: 260px
Mineral.caption: Crystal structure of jennite: elementary unit cell viewed in 3D
Mineral.formula: Ca9Si6O18(OH)6·8H2O
Mineral.IMAsymbol: Jnn
Mineral.molweight: 1,063 g/mol
Mineral.strunz: 9.DG.20
Mineral.system: Triclinic
Mineral.class: Pinacoidal () (same H-M symbol)
Mineral.symmetry: P
Mineral.unit cell: a = 10.56, b = 7.25 c = 10.81 [Å]; α = 99.7° β = 97.67°, γ = 110.07°; Z = 1
Mineral.color: White
Mineral.habit: Blade shaped crystals, fibrous aggregates, platy – sheet forms
Mineral.cleavage: Distinct on [001]
Mineral.mohs: 3.5
Mineral.luster: Vitreous (glassy)

via Wikipedia infobox

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Encyclopedic overview

4 sections

Contents

Cement chemistry
See also
References
Further reading

Jennite is a calcium silicate hydrate mineral of general chemical formula: Ca9Si6O18(OH)6·8H2O.

Jennite occurs as an alteration mineral in metamorphosed limestone and skarn. It typically occurs as vein and open space fillings as a late mineral phase. It also occurs in hydrated cement paste.

Excerpted from Wikipedia’s “jennite” article, available under the CC BY-SA 4.0 licence.