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Hillite Mineral Data

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General Hillite Information

Help on Chemical  Formula: Chemical Formula: Ca2(Zn, Mg)[PO4]2•2(H2O)
Help on Composition: Composition: Molecular Weight = 356.69 gm
   Sodium       0.06 %  Na    0.09 % Na2O
   Calcium     21.46 %  Ca   30.03 % CaO
   Magnesium    2.59 %  Mg    4.29 % MgO
   Zinc        11.73 %  Zn   14.60 % ZnO
   Phosphorus  17.63 %  P    40.39 % P2O5
   Hydrogen     1.13 %  H    10.10 % H2O
   Oxygen      45.39 %  O
              ______        ______ 
              100.00 %       99.51 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.91Na0.01Zn0.64Mg0.38(PO4)2.03•2(H2O)
Help on Environment: Environment: Secondary mineral in a gossan on poorly-sorted argillacous siltstones. Zn-dominant analogue of collinsite
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Lower Cambrian Parachlna Formation, Reaphook Hill, South Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Roderik Hill (1949-), Chief of Mineral Research Division, CSIRO, Melbourne, Autralia.
Help on Synonym: Synonym: Collinsite-Zn

Hillite Image

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  Hillite   Scholzite

Comments: Morphology of a homogeneous larger cluster of hillite growing on an acicular crystal of scholzite. SEM back-scattered electron image.
Location: Lower Cambrian Parachilna Formation, Reaphook Hill, South Australia, Australia. Scale: See Image.
© Canadian Mineralogist

Hillite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8476:1:0.8071
Help on Cell Dimensions: Cell Dimensions: a = 5.736, b = 6.767, c = 5.462, Z = 1; alpha = 97.41°, beta = 108.59°, gamma = 107.19° V = 190.37 Den(Calc)= 3.11
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.69(1)(100), 3.038(0.4)(101), 3.13(0.37)(020),6.24(0.34)(010), 1.668(0.22), 3.23(0.22)(110), 2.23(0.14)(130),

Physical Properties of Hillite

Help on Cleavage: Cleavage: {010} Perfect, {001} Perfect
Help on Color: Color: Colorless, Gray, Greenish gray, Bluish gray.
Help on Density: Density: 3.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Hillite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.2061,KC= 0.2031
Ncalc = 1.64 - 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.635, b=1.65, g=1.669, bire=0.0340

Calculated Properties of Hillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Hillite =3.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0079091465
Boson Index = 0.9920908535
Help on Photoelectric: Photoelectric: PEHillite = 9.21 barns/electron
U=PEHillite x rElectron Density= 29.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hillite is Not Radioactive

Hillite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.02)Fairfieldite Subgroup (Triclinic: P-1�) Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1
Help on  Strunz Class: Strunz Class: 08.CG.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
08.CG.05 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1
08.CG.05 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1
08.CG.05 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1
08.CG.05 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1
08.CG.05 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1
08.CG.05 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri
08.CG.05 Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 21/a 2/m
08.CG.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1
08.CG.05 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1

Other Hillite Information

Help on References: References: NAME( CanMin, 41:982) PHYS. PROP.(CanMin, 41:982) OPTIC PROP.(CanMin, 41:982)
Help on See Also: See Also: Links to other databases for Hillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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


Ca2(Zn, Mg)[PO4]2•2(H2O)
Dana No: Strunz No: 08.CG.05





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