Whitlockite Mineral Data

Whitlockite Mineral Data
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General Whitlockite Information

Help on Chemical Formula: Chemical Formula: Ca9(Mg,Fe++)(PO4)6(PO3OH)
Help on Composition: Composition: Molecular Weight = 1,071.45 gm
   Calcium     33.66 %  Ca   47.10 % CaO
   Magnesium    1.59 %  Mg    2.63 % MgO
   Iron         2.61 %  Fe    3.35 % FeO
   Phosphorus  20.24 %  P    46.37 % P2O5
   Hydrogen     0.09 %  H     0.84 % H2O
   Oxygen      41.81 %  O
              ______        ______ 
              100.00 %      100.30 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca9Mg0.7Fe2+0.5(PO4)6(PO3OH)
Help on Environment: Environment: Secondary mineral in complex zoned granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1941
Help on Locality: Locality: Palermo #1 mine, near North Groton, Grafton County, New Hampshire, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Herbert Percy Whitlock (1868-1948), American mineralogist, Curator, American Museum of Natural History, New York City, NY, USA.
Help on Name Pronunciation: Name Pronunciation: Whitlockite + Pronunciation Say WHITLOCKITE
 

Whitlockite Image

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Whitlockite

Comments: Clear, transparent whitlockite crystal.
Location: Palermo #1 mine, North Groton, Grafton County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Whitlockite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:3.59177
Help on Cell Dimensions: Cell Dimensions: a = 10.33, c = 37.103, Z = 6; V = 3,428.79 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.837(1), 1.701(0.8), 2.572(0.8),
Help on Forms: Forms:

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Forms: ( 1 0 4) ( 1 0 2) ( 1 1 0) ( 0 0 1)

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Click Here for Large Whitlockite Structure Window Crystal Structure:

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Calvo C , Gopal R , American Mineralogist , 60 (1975) p.120-133, The crystal structure of whitlockite from the Palermo quarry

 

Physical Properties of Whitlockite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Gray, Gray white, Yellowish, White.
Help on Density: Density: 3.13
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Pistolitic - > 3mm rounded spherical grains.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white
 

Optical Properties of Whitlockite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2018,KPDmeas= 0.2005,KC= 0.1982
Ncalc = 1.62
Help on Optical Data: Optical Data: Uniaxial (-), e=1.626, w=1.629, bire=0.0030.
 

Calculated Properties of Whitlockite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Whitlockite =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.002795715
Boson Index = 0.997204285
Help on Photoelectric: Photoelectric: PEWhitlockite = 5.91 barns/electron
U=PEWhitlockite x rElectron Density= 18.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Whitlockite is Not Radioactive
 

Whitlockite Classification
Help on Dana Class: Dana Class: 38.03.04.01 (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.04)Whitlockite group
 
38.03.04.01 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m
 
38.03.04.02 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m
 
38.03.04.03 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m
 
38.03.04.04 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m
 
38.03.04.05 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m
 
38.03.04.06 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m
 
38.03.04.07 Tuite! Ca3(PO4)2 R 3m 3m
 
38.03.04.08 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m
Help on Strunz Class: Strunz Class: 08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
 
08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m
 
08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m
 
08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m
 
08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m
 
08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m
 
08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m
 
08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m
 
08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m
 

Other Whitlockite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Whitlockite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Whitlockite Specimen Label here :

Whitlockite

Ca9(Mg,Fe++)(PO4)6(PO3OH)
Dana No: 38.03.04.01 Strunz No: 08.AC.45
Locality:

 

Notes: