Afwillite
A variety of Minerals
What is Afwillite?
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. Afwillite is typically found in veins of spurrite and it belongs to the nesosilicate sub-class. It is monoclinic, its space group is P2 and its point group is 2.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Afwillite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Afwillite Localities Map
See where Afwillite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, white
- Hardness (Mohs)
- 3 - 4
- Density
- 2.643 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca3(HSiO4)2 · 2H2O
- Elements
- Ca, H, O, Si
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Afwillite FAQs
How do I identify Afwillite?
Afwillite can be identified by its hardness of 3 - 4 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Afwillite?
Afwillite typically appears in Colourless, white. Color can vary depending on impurities and formation conditions.
How hard is Afwillite?
Afwillite has a hardness of 3 - 4 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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