Parahopeite Mineral Data
General Parahopeite Information
Chemical Formula:
Zn3(PO4)2•4(H2O)
Composition:
Molecular Weight = 458.17 gm
Zinc 42.82 % Zn 53.29 % ZnO
Phosphorus 13.52 % P 30.98 % P2 O5
Hydrogen 1.76 % H 15.73 % H2 O
Oxygen 41.90 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Zn3 (PO4 )2 •4(H2 O)
IMA Status:
Valid Species (Pre-IMA) 1908
Locality:
Kabwe (Broken Hill), Central province, Zambia Link to MinDat.org Location Data.
Name Origin:
Named for it's dimorphic relationship to hopeite.
Name Pronunciation:
Parahopeite + Pronunciation
Synonym:
ICSD 16979
PDF 39-1352
Parahopeite Image
Images:
Parahopeite Crystallography
Axial Ratios:
a:b:c =0.7625:1:0.6993
Cell Dimensions:
a = 5.755, b = 7.547, c = 5.278, Z = 1; alpha = 93.35°, beta = 91.18°, gamma = 91.42° V = 228.73 Den(Calc)= 3.33
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 7.56(1), 2.99(0.9), 4.48(0.7),
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Forms:
( 1 1 1)
( 0 1 1)
( 0 1 0)
( 3 2 2)
( 1 1 1)
( 1 1 0)
( 0 1 1)
( 1 0 0)
( 0 0 1)
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Physical Properties of Parahopeite
Cleavage:
{???} Distinct
Color:
Colorless.
Density:
3.3
Diaphaneity:
Transparent
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
3.5 - Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Parahopeite
Gladstone-Dale:
CI meas = 0.025 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = 0.034 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1878,KPDmeas = 0.1895,KC = 0.1944 Ncalc = 1.64 - 1.65
Optical Data:
Biaxial (+), a=1.614, b=1.625, g=1.637, bire=0.0230
Calculated Properties of Parahopeite
Electron Density:
Bulk Density (Electron Density)=3.23 gm/cc note: Specific Gravity of Parahopeite =3.30 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEParahopeite = 21.64 barns/electronU=PEParahopeite x r Electron Density= 69.82 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Parahopeite is Not Radioactive
Parahopeite Classification
Dana Class:
40.03.03.01 (40) Hydrated Phosphates, etc
(40.03) where (A++)3 (XO4)2 � x(H2O)
(40.03.03) Dana Group
40.03.03.01 Parahopeite Zn3(PO4)2•4(H2O) P1 1
Strunz Class:
08.CA.70 08 - PHOSPHATES, ARSENATES, VANADATES
08.C - Phosphates without Additional Anions, with H2O
08.CA -With small and large/medium cations
08.CA.70 Parahopeite Zn3(PO4)2•4(H2O) P1 1
Other Parahopeite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Parahopeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Parahopeite
Zn3(PO4)2•4(H2O)
Dana No: 40.03.03.01 Strunz No: 08.CA.70
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