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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.2061,KC= 0.2031
Ncalc = 1.64 - 1.65

Optical Data:

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

Calculated Properties of Hillite

Electron Density:

Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Hillite =3.18 gm/cc.

Fermion Index:

Fermion Index = 0.0079091465
Boson Index = 0.9920908535

Photoelectric:

PE_Hillite= 9.21 barns/electron
U=PE_Hillite x rElectron Density= 29.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hillite is Not Radioactive

Hillite Classification

Dana Class:

40.02.02.09 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.02)Fairfieldite Subgroup (Triclinic: P-1¯)

40.02.02.01 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1

40.02.02.02 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1

40.02.02.03 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1

40.02.02.04 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1

40.02.02.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1

40.02.02.06 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1

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

40.02.02.08 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri

40.02.02.09 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1

40.02.02.10 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1

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

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 - 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

Search for Hillite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Hillite :

A Bijoux Google Search for Hillite
Adam's Minerals Google Search for Hillite
Cape Minerals Google Search for Hillite
Dakota Matrix Minerals Google Search for Hillite
Excalibur Mineral Corp. Google Search for Hillite
Exceptional Minerals Google Search for Hillite
John Betts Fine Minerals Search for Hillite
McDougall Minerals Google Search for Hillite
Mineral News Website Link
Rock and Mineral Shows Google Search for Hillite
Weinrich Minerals, Inc. Google Search for Hillite

Ask about Hillite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Hillite

Ca2(Zn, Mg)[PO4]2•2(H2O)
Dana No: 40.02.02.09 Strunz No: 08.CG.05
Locality:

Notes: