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Alforsite

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John T. Alfors
Formula:
Ba5(PO4)3Cl
System:
Hexagonal
Colour:
Colorless
Hardness:
5
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.

Classification of Alforsite

Approved 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
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Type Occurrence of Alforsite

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 147511.
Year of Discovery:
1980
Geological Setting of Type Material:
Contact metamorphosed barium-rich metasediments

Occurrences of Alforsite

Geological Setting:
In lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite.

Physical Properties of Alforsite

Vitreous, Sub-Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Streak:
White
Hardness (Mohs):
5
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.80 g/cm3 (Calculated)
Comment:
Also 4.73

Crystallography of Alforsite

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Space Group Setting:
P63/m
Cell Parameters:
a = 10.25Å, c = 7.64Å
Ratio:
a:c = 1 : 0.745
Unit Cell Volume:
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 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

Optical Data of Alforsite

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 Alforsite

Formula:
Ba5(PO4)3Cl
Essential elements:
All elements listed in formula:

Relationship of Alforsite to other Species

Other Members of Group:
BellitePb5 (AsO4,CrO4, SiO2)3Cl
Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
ChlorapatiteCa5(PO4)3Cl
FluorapatiteCa2Ca3(PO4)3F
HydroxylapatiteCa5(PO4)3(OH)
Hydroxylapatite-MCa5(PO4)3OH
HydroxylpyromorphitePb5(PO4)3(OH)
JohnbaumiteCa5(AsO4)3OH
Johnbaumite-MCa5(AsO4)3OH
Manganapatite
MimetitePb5(AsO4)3Cl
Mimetite-2M
Miyahisaite(Sr,Ca)2Ba3(PO4)3F
Mn-bearing Fluorapatite(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
OxypyromorphitePb10(PO4)6O
PieczkaiteMn5(PO4)3Cl
PyromorphitePb5(PO4)3Cl
StronadelphiteSr5(PO4)3F
SvabiteCa5(AsO4)3F
TurneaureiteCa5(AsO4)3Cl
Unnamed (F-analogue of Pyromorphite)Pb5(PO4)3F
Unnamed (OH-analogue of Mimetite)Pb5(AsO4)3(OH)
VanadinitePb5(VO4)3Cl
8.BN.05Belovite-(Ce)NaCeSr3(PO4)3F
8.BN.05Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
8.BN.05Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)
8.BN.05ChlorapatiteCa5(PO4)3Cl
8.BN.05Mimetite-MPb5(AsO4)3Cl
8.BN.05Johnbaumite-MCa5(AsO4)3OH
8.BN.05FluorapatiteCa2Ca3(PO4)3F
8.BN.05HedyphanePb3Ca2(AsO4)3Cl
8.BN.05HydroxylapatiteCa5(PO4)3(OH)
8.BN.05JohnbaumiteCa5(AsO4)3OH
8.BN.05MimetitePb5(AsO4)3Cl
8.BN.05MorelanditeCa2Ba3(AsO4)3Cl
8.BN.05PyromorphitePb5(PO4)3Cl
8.BN.05FluorstrophiteSrCaSr3(PO4)3F
8.BN.05SvabiteCa5(AsO4)3F
8.BN.05TurneaureiteCa5(AsO4)3Cl
8.BN.05VanadinitePb5(VO4)3Cl
8.BN.05Belovite-(La)NaLaSr3(PO4)3F
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
8.BN.05FluorcaphiteSrCaCa3(PO4)3F
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5
8.BN.05Hydroxylapatite-MCa5(PO4)3OH
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3Cl
8.BN.05StronadelphiteSr5(PO4)3F
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3F
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3F
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F
8.BN.10ArctiteNa2Ca4(PO4)3F
22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2O
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2O
22.2.3ChlorapatiteCa5(PO4)3Cl
22.2.4TurneaureiteCa5(AsO4)3Cl
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3Cl
22.2.10MimetitePb5(AsO4)3Cl
22.2.11Mimetite-MPb5(AsO4)3Cl
22.2.12SahlinitePb14(AsO4)2O9Cl4
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)
22.2.14VanadinitePb5(VO4)3Cl
22.2.15KombatitePb14(VO4)2O9Cl4
22.2.16LeningraditePbCu3(VO4)2Cl
22.2.17HedyphanePb3Ca2(AsO4)3Cl
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2O

Other Names for Alforsite

Name in Other Languages:
German:Alforsit
Simplified Chinese:氯磷钡石
Spanish:Alforsita
Traditional Chinese:氯磷鋇石

Other Information

Not fluorescent, but bright purple/violet cathodluminescence
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 Alforsite

Reference List:
Newberry, N.G., Essene, E.J., and Peacor, D.R. (1981) Alforsite, a new member of the apatite group, the barium analogue of chlorapatite. American Mineralogist: 66: 1050-1053.

Acta Crystallographica:: B35: 2382-2384.

Internet Links for Alforsite

Localities for Alforsite

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.
Canada
 
  • Yukon Territory
    • 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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