General Alforsite Information
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Chemical Formula: |
Ba5(PO4)3Cl |
Composition: |
Molecular Weight = 1,007.00 gm |
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Barium 68.19 % Ba 76.13 % BaO |
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Phosphorus 9.23 % P 21.14 % P2O5 |
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Chlorine 3.52 % Cl 3.52 % Cl |
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- % Cl -0.79 % -O=Cl2
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Oxygen 19.07 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ba5(PO4)3Cl |
Environment: |
In lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite. |
IMA Status: |
Approved IMA 1981 |
Locality: |
From Big Creek and Rush Creek, Fresno Co., and on Trumbull Peak, near Incline, Marisopa Co., California, USA. Link to MinDat.org Location Data. |
Name Origin: |
To honor Dr. John T. Alfors (1930- ), geologist, California Division of Mines, for his work on the type locality. |
Synonym: |
ICSD 8191 |
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PDF 35-691 |
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Images:
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Alforsite Crystallography
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Axial Ratios: |
a:c = 1:0.74536 |
Cell Dimensions: |
a = 10.25, c = 7.64, Z = 2; V = 695.14 Den(Calc)= 4.81 |
Crystal System: |
Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m |
X Ray Diffraction: |
By Intensity(I/Io): 3.06(1), 2.13(0.3), 2.95(0.3), |
Crystal Structure:
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Hata M , Marumo F , Iwai S , Aoki H , Acta Crystallographica, Section B , 35 (1979) p.2382-2384, Structure of barium chlorapatite
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Physical Properties of Alforsite
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Color: |
Colorless. |
Density: |
4.73 |
Diaphaniety: |
Transparent |
Hardness: |
5 - Apatite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Alforsite
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Gladstone-Dale: |
CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1455,KPDmeas= 0.148,KC= 0.1473 |
Optical Data: |
Uniaxial (-), e=1.7, w=1.7, bire=0.0000. |
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Calculated Properties of Alforsite
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Electron Density: |
relectron=4.11 gm/cc note: rAlforsite =4.73 gm/cc. |
Fermion Index |
Fermion Index = 0.12161 Boson Index = 0.87839 |
Photoelectric: |
PEAlforsite = 314.92 barns/electron U=PEAlforsite x relectron=1,295.80 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Alforsite is Not Radioactive |
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Alforsite Classification
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Dana Class: |
41.8.5.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.8)where (A)5 (XO4)3 Zq |
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(41.8.5)Dana Group |
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41.8.5.1 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 63/m,P 63 Hex |
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41.8.5.2 Alforsite Ba5(PO4)3Cl P 63/m 6/m |
Strunz Class: |
VII/B.39-120 VII - Phosphates, Arsenates and Vanadates |
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VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb |
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VII/B.39 - Apatite - Pyromorphite group |
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VII/B.39-10 Fluorapatite Ca5(PO4)3F P 63/m 6/m |
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VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 63/m 6/m |
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VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 63/m 6/m |
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VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 63/m 6/m |
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VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 63/m 6/m |
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VII/B.39-60 Svabite Ca5(AsO4)3F P 63/m 6/m |
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VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 63/m 6/m |
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VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 63/m,P 63 Hex |
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VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 63/m 6/m |
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VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 63 6 |
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VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 63/m 6/m |
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VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3 |
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VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3 |
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VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3 |
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VII/B.39-120 Alforsite Ba5(PO4)3Cl P 63/m 6/m |
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VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 63/m,P 63 Hex |
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VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 63/m 6/m |
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VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 63/m 6/m |
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VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 63/m 6/m |
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VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 21/b 2/m |
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VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 63/m 6/m |
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Other Alforsite Information
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References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Alforsite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 - Mineral and Gemstone Kingdom
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Alforsite Specimen Label here :
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Alforsite
Ba5(PO4)3Cl
Dana No: 41.8.5.2 Strunz No: VII/B.39-120
Locality:
Notes:
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