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Alforsite

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John T. Alfors
Formula:
Ba5(PO4)3Cl
Colour:
Colorless
Lustre:
Vitreous, Sub-Vitreous
Hardness:
5
Specific Gravity:
4.80 (Calculated)
Crystal System:
Hexagonal
Name:
Named by N. G. Newberry, Eric J. Essene, and Donald R. Peacor in honor of John T. Alfors [November 24, 1930 Reedley, CA, USA - December 27, 2005 Davis, CA], geologist and systematic mineralogist with the California geological Survey, USA.
Apatite Group. The barium analogue of Chlorapatite.



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Classification of AlforsiteHide

Approved
Approval Year:
1980
7/B.39-120
8.BN.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
41.8.5.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.2.7

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride

Physical Properties of AlforsiteHide

Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.80 g/cm3 (Calculated)
Comment:
Also 4.73

Optical Data of AlforsiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.700 nε = 1.701
Birefringence:
0.001
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of AlforsiteHide

Formula:
Ba5(PO4)3Cl

Crystallography of AlforsiteHide

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Setting:
P63/m
Cell Parameters:
a = 10.25 Å, c = 7.64 Å
Ratio:
a:c = 1 : 0.745
Unit Cell V:
695.14 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals are subhedral, to 0.2 mm, in very fine-grained masses.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.06 (100)
2.13 (40)
2.03 (30)
1.928 (30)
1.566 (30)
1.336 (30)
1.077 (30)
Comments:
Synthetic material

Type Occurrence of AlforsiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 147511.
Geological Setting of Type Material:
Contact metamorphosed barium-rich metasediments
Associated Minerals at Type Locality:

Synonyms of AlforsiteHide

Other Language Names for AlforsiteHide

German:Alforsit
Simplified Chinese:氯磷钡石
Spanish:Alforsita
Traditional Chinese:氯磷鋇石

Relationship of Alforsite to other SpeciesHide

Other Members of this group:
ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
HydroxylpyromorphitePb5(PO4)3(OH)
JohnbaumiteCa5(AsO4)3OHHex. 6/m : P63/m
MimetitePb5(AsO4)3ClHex. 6/m : P63/m
OxypyromorphitePb10(PO4)6O
PieczkaiteMn5(PO4)3ClHex. 6/m : P63/m
PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
StronadelphiteSr5(PO4)3FHex. 6/m : P63/m
SvabiteCa5(AsO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
TurneaureiteCa5(AsO4)3ClHex.
Unnamed (F-analogue of Pyromorphite)Pb5(PO4)3F
Unnamed (OH-analogue of Mimetite)Pb5(AsO4)3(OH)
VanadinitePb5(VO4)3ClHex. 6/m : P63/m

Common AssociatesHide

CelsianBa(Al2Si2O8)
FluorapatiteCa5(PO4)3F
FresnoiteBa2Ti(Si2O7)O
GillespiteBaFe2+Si4O10
PyriteFeS2
QuartzSiO2
SanborniteBa2(Si4O10)
TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
TourmalineA(D3)G6(T6O18)(BO3)3X3Z
WalstromiteBaCa2(Si3O9)
WitheriteBaCO3
Associated Minerals Based on Photo Data:
Titantaramellite3 photos of Alforsite associated with Titantaramellite on mindat.org.
Sanbornite3 photos of Alforsite associated with Sanbornite on mindat.org.
Quartz3 photos of Alforsite associated with Quartz on mindat.org.
Gillespite2 photos of Alforsite associated with Gillespite on mindat.org.
Celsian1 photo of Alforsite associated with Celsian on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BN.05Belovite-(Ce)NaCeSr3(PO4)3FTrig. 3 : P3
8.BN.05Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)Hex.
8.BN.05Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)Hex.
8.BN.05ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
8.BN.05Mimetite-MPb5(AsO4)3ClMon. 2/m : P21/b
8.BN.05Johnbaumite-MCa5(AsO4)3OHMon. 2/m : P21/m
8.BN.05FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
8.BN.05HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
8.BN.05HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
8.BN.05JohnbaumiteCa5(AsO4)3OHHex. 6/m : P63/m
8.BN.05MimetitePb5(AsO4)3ClHex. 6/m : P63/m
8.BN.05MorelanditeCa2Ba3(AsO4)3Cl
8.BN.05PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
8.BN.05FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
8.BN.05SvabiteCa5(AsO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
8.BN.05TurneaureiteCa5(AsO4)3ClHex.
8.BN.05VanadinitePb5(VO4)3ClHex. 6/m : P63/m
8.BN.05Belovite-(La)NaLaSr3(PO4)3FTrig. 3 : P3
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5Trig.
8.BN.05FluorcaphiteSrCaCa3(PO4)3FHex. 6/m : P63/m
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5Trig. 3 : P3
8.BN.05Hydroxylapatite-MCa5(PO4)3OHMon. 2/m : P21/b
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3ClHex. 6/m : P63/m
8.BN.05StronadelphiteSr5(PO4)3FHex. 6/m : P63/m
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3FHex. 6/m : P63/m
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3FTrig. 3 : P3
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F Hex. 6/m : P63/m
8.BN.10ArctiteNa2Ca4(PO4)3FTrig. 3m (3 2/m) : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

41.8.5.1MorelanditeCa2Ba3(AsO4)3Cl

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2OMon. 2/m
22.2.3ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
22.2.4TurneaureiteCa5(AsO4)3ClHex.
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2OMon. 2/m
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
22.2.10MimetitePb5(AsO4)3ClHex. 6/m : P63/m
22.2.11Mimetite-MPb5(AsO4)3ClMon. 2/m : P21/b
22.2.12SahlinitePb14(AsO4)2O9Cl4Mon.
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
22.2.14VanadinitePb5(VO4)3ClHex. 6/m : P63/m
22.2.15KombatitePb14(VO4)2O9Cl4Mon.
22.2.16LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam
22.2.17HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2OTric. 1 : P1

Fluorescence of AlforsiteHide

Not fluorescent, but bright purple/violet cathodluminescence

Other InformationHide

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 AlforsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hata, M., Marumo, F., Iwai, S. (1979) Structure of barium chlorapatite. Acta Crystallographica: B35: 2382-2384.
Newberry, N.G., Essene, E.J., Peacor, D.R. (1981) Alforsite, a new member of the apatite group, the barium analogue of chlorapatite. American Mineralogist: 66: 1050-1053.

Internet Links for AlforsiteHide

Localities for AlforsiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Yukon
    • Watson Lake Mining District
      • Itsi Mt.
        • Wilson Lake
McNeil, L.A., Peterson, R.C., Färber, G., Groat, L. & Witzke, T. (2013) Mineralogical studies of a low-temperature barium-rich skarn deposit, Gunn claim, Yukon Territory. Abstract with Program, Min. Ass. Canada Annual Mtg. Winnipeg, May 2013.
Mexico
 
  • Baja California (Baja California Norte; BC Norte)
    • Tres Pozos
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 4, 2000; American Mineralogist, Volume 69, pages 358-373, 1984
USA (TL)
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 314.
[MinRec 33:161]; American Mineralogist (1981), Volume 66, pages 1050-1053
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 315; Mineralogical Record (1999): 30: 414; American Mineralogist (1981), Volume 66, pages 1050-1053.
    • Tulare Co.
      • Dumtah
Mineralogical Record: 34(2): 159-166
Mineral and/or Locality  
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