afwillite
Sign in to saveAfwillite is a calcium hydroxide nesosilicate mineral with formula Ca3(SiO3OH)2·2H2O. It occurs as glassy, colorless to white prismatic monoclinic crystals. Its Mohs scale hardness is between 3 and 4. It occurs as an alteration mineral in contact metamorphism of limestone. It occurs in association with apophyllite, natrolite, thaumasite, merwinite, spurrite, gehlenite, ettringite, portlandite, hillebrandite, foshagite, brucite and calcite.
Key facts
- Mineral.name
- Afwillite
- Mineral.category
- Nesosilicates
- Mineral.image
- Afwillite 2 on rock Hydrous calcium silicate Crestmore Quarry Riverside California 2068.jpg
- Mineral.caption
- Afwillite from Crestmore Quarry, Riverside County, California
- Mineral.formula
- Ca3(SiO3OH)2·2H2O
- Mineral.IMAsymbol
- Afw
- Mineral.strunz
- 9.AG.75
- Mineral.system
- Monoclinic
- Mineral.class
- Domatic (m) (same H-M symbol)
- Mineral.symmetry
- Cc
- Mineral.unit cell
- a = 16.278(1), b = 5.6321(4) c = 13.236(1) [Å]; β = 134.9°; Z = 4
- Mineral.color
- Colorless, white
- Mineral.habit
- Prismatic (striated), tabular, radial fibrous, massive
- Mineral.cleavage
- Perfect along [10], good along [100]
- Mineral.fracture
- Conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 3–4
- Mineral.luster
- Vitreous
via Wikipedia infobox
Wikidata facts
- Image
- Afwillite-356015.jpg
Show 6 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.AG.75
- Commons category
- Afwillite
- Nickel-Strunz 9th edition (updated 2009)
- 9.AG.75
- IMA Mineral Symbol
- Afw
- chemical formula
- Ca₃[SiO₃(OH)]₂·2H₂O
- Strunz 8th edition (series ID, updated)
- VIII/A’.06b
Sources (1)
via Wikidata · CC0
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Article
5 sectionsContents
- Formation
- Structure and properties
- Occurrence in concrete
- See also
- References
Afwillite is a calcium hydroxide nesosilicate mineral with formula Ca3(SiO3OH)2·2H2O. It occurs as glassy, colorless to white prismatic monoclinic crystals. Its Mohs scale hardness is between 3 and 4. It occurs as an alteration mineral in contact metamorphism of limestone. It occurs in association with apophyllite, natrolite, thaumasite, merwinite, spurrite, gehlenite, ettringite, portlandite, hillebrandite, foshagite, brucite and calcite.
It was first described in 1925 for an occurrence in the Dutoitspan Mine, Kimberley, South Africa and was named for Alpheus Fuller Williams (1874–1953), a past official of the De Beers diamond company.