Topics CoveredIntroduction to AfwilliteProperties of AfwilliteHow to Identify AfwilliteGlobal Iron Ore Mining Process Flow Chart DistributionOccurrence of Afwillite and Useful Mineral AssociationReferencesIntroduction to AfwilliteChemical Formula – Ca3(HSiO4).2H2OAfwillite is named after Alpheus Fuller Williams (1874-1953), the General Manager of DeBeers Consolidated Mines, South Africa. It was discovered in the year 1925 at the Dutoitspan Mines, South Africa.Properties of AfwilliteThe key physical properties of Afwillite are as below:Cell DataSpace group: Cca = 16.278(1)b=5.6321(4)c=13.236(1)Z = 4Crystal DataMonoclinicPoint group: mCrystals – prismatic, elongated and striated II [010], to 11 cm, many tabular on 100 and 201; in radial fibrous spherulites; massiveX-ray powder pattern: Kimberly, South Africa2.83 (100), 6.61 (90), 3.18 (90), 2.73 (90), 3.28 (70), 2.15 (70), 2.34 (60)Chemical CompositionElementsContent 1Content 2Content3SiO233.9634.6535.09Al2O3, Fe2O30.60--MgO-trace-CaO49.2848.9449.13F-0.18-H2O+15.8916.0815.78H2O-0.120.01--O=F2-0.10-Optical PropertiesTransparentOptical class- Biaxial (+)Lustre – VitreousEstimated PropertiesElectron densityBulk density (electron density)= 2.66 g/cm3note: Specific gravity of Afwillite = 2.62 g/cm3PhotoelectricPEAfwillite = 4.90 barns/electronU=PEAfwillite x ρelectron density= 13.06 barns/cm3Fermion indexFermion index = 0.008Boson index = 0.99RadioactivityGRapi = 0 (Gamma Ray American Petroleum Institute Units)Afwillite is not radioactiveHow to Identify AfwilliteThe color of afwillite varies from colorless to white. It rock crushing machine for sale is brittle by nature and exhibits a vitreous lustre. Its hardness varies from 3 to 4.Global DistributionAfwillite is widely distributed in the following locations:South Africa – from Dutoitspan Diamond Mine, Kimberly;Wessels Mine, Cape ProvinceIreland – from Scawt Hill,AntrimGermany – Schellhopf, Eifel District; Zeilberg, BavariaItaly- from Campomorto, LazioIsrael – from Nahal AyalonUSA – from Crestmore, Riverside,v> CalofirniaJapan- from Mihara mine, Okayama Perfecture.Occurrence of Afwillite and Useful Mineral AssociationAfwillite is a product formed during the metamorphism of limestones. It is often associated with minerals such as natrolite, merwinite, ettringite, brucite, calcite, foshagite, portlandite and hillebrandite.ReferencesAfwillite Mineral Data – WebmineralAfwillite Mineral Data – MindatAfwillite Mineral Data – Rruff Project Website, University of Arizona.
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