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Afwillite

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Formula:
Ca3(HSiO4)2 · 2H2O
System:
Monoclinic
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
3 - 4
Name:
Named in 1925 by John Parry and Frederick Eugene Wright in honor of Alpheus Fuller Williams [June 21, 1874 Oakland Alameda County California, USA - January 6, 1953 Cape Town, Western Cape, South Africa] of the De Beers Consolidated Mines of South Africa.
This page provides mineralogical data about Afwillite.

Classification of Afwillite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.AG.75

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
52.4.7.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
14.5.11

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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First Recorded Occurrence of Afwillite

Year of Discovery:
1925

Occurrences of Afwillite

Geological Setting:
Contact metamorphism of limestones.

Physical Properties of Afwillite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless, white
Streak:
White
Hardness (Mohs):
3 - 4
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {101}, good on {100}
Fracture:
Conchoidal
Density:
2.630 g/cm3 (Measured)    2.643(5) g/cm3 (Calculated)

Crystallography of Afwillite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Cell Parameters:
a = 16.278(1) Å, b = 5.6321(4) Å, c = 13.236(1) Å
β = 134.9°
Ratio:
a:b:c = 2.89 : 1 : 2.35
Unit Cell Volume:
V 859.55 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals are prismatic, tabular, radial fibrous spherulites, massive

Optical Data of Afwillite

Type:
Biaxial (+)
RI values:
nα = 1.617 nβ = 1.620 nγ = 1.634
2V:
Measured: 50° to 56°
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v

Chemical Properties of Afwillite

Formula:
Ca3(HSiO4)2 · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Mg,F

Relationship of Afwillite to other Species

9.AG.05AbswurmbachiteCuMn63+(SiO4)O8
9.AG.05BrauniteMn2+Mn63+(SiO4)O8
9.AG.05NeltneriteCaMn63+(SiO4)O8
9.AG.05Braunite-IICaMn143+(SiO4)O20
9.AG.10Långbanite(Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16
9.AG.15MalayaiteCaSn(SiO4)O
9.AG.15TitaniteCaTi(SiO4)O
9.AG.15VanadomalayaiteCaV4+(SiO4)O
9.AG.15Natrotitanite(Na0.5Y0.5)Ti(SiO4)O
9.AG.20Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
9.AG.20Cerite-(La)(La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3(HSiO4)4(OH)3
9.AG.20Aluminocerite-(Ce)(Ce,La,Ca)9(Al,Fe3+)(SiO4)3(HSiO4)4(OH)3
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5
9.AG.25Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2O
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2O
9.AG.40aNatisiteNa2Ti(SiO4)O
9.AG.40bParanatisiteNa2Ti(SiO4)O
9.AG.45Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)
9.AG.45Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5
9.AG.55ChantaliteCaAl2(SiO4)(OH)4
9.AG.60MozartiteCaMn3+(SiO4)(OH)
9.AG.60VuagnatiteCaAl(SiO4)(OH)
9.AG.65HatruriteCa3(SiO4)O
9.AG.70JasmunditeCa11(SiO4)4O2S
9.AG.80BultfonteiniteCa2(HSiO4)F · H2O
9.AG.85ZoltaiiteBaV24+V123+(SiO4)2O19
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O4
14.5.1WollastoniteCaSiO3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2MCaSiO3
14.5.4RankiniteCa3Si2O7
14.5.5KilchoaniteCa6(SiO4)(Si3O10)
14.5.6LarniteCa2SiO4
14.5.7BredigiteCa7Mg(SiO4)4
14.5.8HatruriteCa3(SiO4)O
14.5.9RosenhahniteHCa3[Si3O9(OH)]
14.5.10DellaiteCa6(Si2O7)(SiO4)(OH)2
14.5.12XonotliteCa6(Si6O17)(OH)2
14.5.13FoshagiteCa4(Si3O9)(OH)2
14.5.14HillebranditeCa2(SiO3)(OH)2
14.5.15JaffeiteCa6(Si2O7)(OH)6
14.5.16SuoluniteCa2(H2Si2O7) · H2O
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2
14.5.18OkeniteCaSi2O5 · 2H2O
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2O
14.5.20TrabzoniteCa4(Si3O10) · 2H2O
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.25NekoiteCa3Si6O15·7H2O
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2O

Other Names for Afwillite

Name in Other Languages:
Dutch:Afwilliet
German:Afwillit
Italian:Afwillite
Latvian:Afvilīts
Spanish:Afwillita

Other Information

Electrical:
Piezoelectric
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Afwillite

Reference List:
Mineralogical Magazine (1925) 20: 277-285.

American Mineralogist: 10: 447.

Acta Crystallographica: B32: 475-480.

Internet Links for Afwillite

Localities for Afwillite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Styria
    • Bad Radkersburg
      • Klöch
Walter Trattner collection
France
 
  • Auvergne
    • Puy-de-Dôme
      • Clermont-Ferrand
        • Ceyrat
Grünhagen H and Mergoil J (1963) Découverte d'hydrocalumite et afwillite associées à l'ettringite dans les porcélanites de Boisséjour près Ceyrat (Puy de Dôme). Bulletin de la Société Française de Minéralogie et de Cristallographie 86: 149-157.
Germany
 
  • Bavaria
    • Franconia
      • Maroldsweisach
Pöllmann, H. (1991): Die Afwillit-Portlandit Paragenese im Basalt des Zeilbergs bei Maroldsweisach/Unterfranken. Aufschluss, 42, 257-266
  • Rhineland-Palatinate
    • Eifel
      • Daun
        • Hinterweiler
Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
        • Üdersdorf
Schüller, W., Betz, V., Die Mineralien vom Emmelberg, Lapis 12/1986
      • Mayen
        • Ettringen
          • Bellerberg volcano
Hentschel, G. (1987): Die Mineralien der Eifelvulkane, Weise (München), 2. Auflage
            • Southern lava flow
              • Mayener Feld
Hentschel, G., Die Mineralien der Eifelvulkane, Weise (München), 1983
      • Mendig
        • Bell
Blass, G., Graf, HW., Kolitsch, U., Sebold, D., Über neue Mineralfunde aus der Vulkaneifel, MW 6/2005
Ireland
 
  • Co. Sligo
    • Killala Bay
Min.Mag.(1974) 39, 544-548
Israel
 
  • Negev
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
  • Tel Aviv District
GROSS, S., MAZOR, E., SASS, E., & ZAK., I. (1967). The mottled zone complex of Ayalon (Israel). Israel Bull. Earth Sciences, 16, 84-96.
Italy
 
  • Latium
    • Rome Province
Caponera, I., Fiori, S., Pucci, R., & Signoretti, E. (2007). I minerali dei Colli Albani. Un aggiornamento sugli ultimi dieci anni di ricerche. Rivista Mineralogica Italiana, 31 (2), 74-91.
      • Rome
        • Valleranello
Luigi Matei photo
    • Viterbo Province
      • Montalto di Castro
        • Pietra Massa Locality
Passaglia, E. & Turconi, B. (1982): Silicati ed altri minerali di Montalto di Castro - VT. Rivista Mineralogica Italiana, 4/1982, 97-110.
  • Umbria
    • Perugia Province
      • Spoleto
Stoppa F., Scordari F., Mesto E., Sharygin V.V. and Bortolozzi G. - Calcium-aluminium-silicate-hydrate "cement" phases and rare Ca-zeolite association at Colle Fabbri, Central Italy (2010). Centr.Eur.J.Geosci. 2 (2), pag. 175-187 .
  • Veneto
    • Vicenza Province
      • Cornedo Vicentino
        • Spagnago
Lapis, 15 (12), 27-32+50.; Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
Japan
 
  • Honshu Island
    • Chugoku Region
      • Hiroshima prefecture
        • Hiba-gun
          • Kushiro
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
      • Okayama Prefecture
        • Ihara City (Ibara City)
          • Higashi-Mihara
KUSACHI, I., HENM, C., & HENMI, K. (1989). Afwillite and jennite from Fuka, Okayama Prefecture, Japan. Mineralogical Journal, 14, 279-292.
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
KUSACHI, I., HENM, C., & HENMI, K. (1989). Afwillite and jennite from Fuka, Okayama Prefecture, Japan. Mineralogical Journal, 14, 279-292. ; Mineralogical Journal Vol. 14 (1989) , No. 7 pp 279-292; Henmi, C., & Kusachi, I. (1992). Clinotobermorite, Ca5Si6 (O, OH) 18· 5H2O, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 56(3), 353-358.
New Zealand
 
  • North Island
    • Northland
      • Kaipara
        • Tokatoka
Railton, G.L. & Watters, W.A., Minerals of New Zealand, New Zealand Geological Survey Bull. #104 (1990).
Palestine
 
  • West Bank
    • Hatrurim formation
Mikhail N. Murashko analytical data
Romania
 
  • Brașov Co.
    • Racoş Commune
Szakáll, S., Kristály, F., 2010. Mineralogy of Székelyland, Eastern Transylvania, Romania. Sfântu Gheorghe-Miercurea Ciuc-Târgu Mureş. 2010.
  • Caraş-Severin Co.
    • Banat Mts
Marincea, S., Dumitraş. D-G., Ghinet, C, Fransolet, A.-M., Hatert, F. & Rondeaux, M. (2011): Gehlenite from three occurrences of high-temperature skarns, Romania: new mineralogical data. Canadian Mineralogist. 49, 1001-1014
  • Harghita Co.
    • Odorheiu Secuiesc (Székelyudvarhely; Oderhellen)
      • Racoş (Racoşu de Jos)
Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Evenkia (Evenkiyskiy Autonomous okrug)
        • Nizhnyaya Tunguska River Basin (Lower Tunguska River)
No reference listed
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Dovyren Highlands
American Mineralogist, Volume 94, pages 323–333, 2009
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
A. E. Zadov data; American Mineralogist, Volume 94, pages 1361–1370, 2009
South Africa
 
  • Northern Cape Province
    • Francis Baard District
      • Kimberley
[Min.Mag.(1925) 20, 277-285; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]
    • Kalahari manganese field
      • Hotazel
Minerals of South Africa
      • Kuruman
        • N'Chwaning Mines
[Von Bezing, K. L. et al. (1991) - The Kalahari (Afrique du Sud) manganese field : an update, Mineralogical Record, 22 (3), 279-302.]
Minerals of South Africa
UK
 
  • Northern Ireland
    • Co. Antrim
      • Glenoe
Nawaz, R. (1977). A second occurrence of killalaite. Mineralogical Magazine, 41, 546-548.
      • Larne
TILLEY, C. E. (1930). An association of afwillite and spurrite. Geological Magazine, 67, 168-169; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 590; Strübel, Zimmer: "Lexikon der Minerale", 2nd Ed., 1991.; Mineralogical Magazine 1942 26 : 190-196
USA
 
  • California
    • Riverside Co.
      • Crestmore
        • Crestmore quarries
          • Sky Blue Hill
Switzer, G., & Bailey, E. H. (1953), Afwillite from Crestmore, California. American Mineralogist: 38: 629-633; Murdoch, Joseph (1954b), Scawtite and bultfonteinite from Crestmore, California: (abstract): Geological Society of America Bulletin: 65: 1347-1348.
  • Missouri
    • Washington Co.
      • Sullivan
R&M 73:2 pp 98-117
Mineral and/or Locality  
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