Hillite Mineral Data

Hillite Mineral Data

General Hillite Information

Chemical Formula:

Ca2(Zn, Mg)[PO4]2·2(H2O)

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

Empirical Formula:

Ca_1.91Na_0.01Zn_0.64Mg_0.38(PO₄)_2.03·2(H₂O)

Environment:

Secondary mineral in a gossan on poorly-sorted argillacous siltstones. Zn-dominant analogue of collinsite

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Lower Cambrian Parachlna Formation, Reaphook Hill, South Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Roderik Hill (1949-), Chief of Mineral Research Division, CSIRO, Melbourne, Autralia.

Synonym:

Collinsite-Zn

IMA2003-005

Hillite Image

Images:

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

Axial Ratios:

a:b:c =0.8476:1:0.8071

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

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Yakubovich O V , Massa W , Liferovich R P , Gavrilenko P G , Bogdanova A N , Tuisku P , The Canadian Mineralogist , 41 (2003) p.981-988, Hillite, a new member of the fairfieldite group: Its description and crystal structure

Physical Properties of Hillite

Cleavage:

[010] Perfect, [001] Perfect

Color:

Colorless, Gray, Greenish gray, Bluish gray.

Density:

3.16

Diaphaniety:

Transparent

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Hillite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2061,KC= 0.2031

Optical Data:

Biaxial (+), a=1.635, b=1.65, g=1.669, bire=0.0340

Calculated Properties of Hillite

Electron Density:

r_electron=3.14 gm/cc
note: r_Hillite=3.16 gm/cc.

Fermion Index

Fermion Index = 0.0079
Boson Index = 0.9921

Photoelectric:

PE_Hillite= 9.21 barns/electron
U=PE_Hillite x r_electron= 28.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hillite is Not Radioactive

Hillite Classification

Dana Class:

40.2.2.9 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.2)Fairfieldite Subgroup (Triclinic: P1¯)

40.2.2.1 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

40.2.2.2 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

40.2.2.3 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

40.2.2.4 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

40.2.2.5 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

40.2.2.6 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

40.2.2.7 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

40.2.2.8 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

40.2.2.9 Hillite ! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

Strunz Class:

VII/C.17-15 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.17 - Collinsite - Wendwilsonite series

VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-15 Hillite Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

Other Hillite Information

References:

NAME( CanMin, 41:982) PHYS. PROP.(CanMin, 41:982) OPTIC PROP.(CanMin, 41:982)

See Also:

Links to other databases for Hillite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Hillite

Ca2(Zn, Mg)[PO4]2·2(H2O)
Dana No: 40.2.2.9 Strunz No: VII/C.17-15
Locality:

Notes: