Hopeite Mineral Data

General Hopeite 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 % P₂O₅

Hydrogen 1.76 % H 15.73 % H₂O

Oxygen 41.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₃(PO₄)₂•4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Vieille Montagne (Altenberg), Moresnet, Liège Province, Belgium. Link to MinDat.org Location Data.

Name Origin:

Named after the Scottish chemist, Thomas Charles Hope (1766-1844).

Name Pronunciation:

Hopeite

Synonym:

ICSD 34869

PDF 37-465

Hopeite Image

Images:

Hopeite

Comments: Brownish pink, transparent crystalline aggregate of hopeite crystals.
Location: Broken Hill mine, Kabwe, Central, Zambia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hopeite Crystallography

Axial Ratios:

a:b:c =0.5785:1:0.2746

Cell Dimensions:

a = 10.597, b = 18.318, c = 5.031, Z = 4; V = 976.60 Den(Calc)= 3.12

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.855(1), 4.576(0.55), 9.16(0.55),

Forms:

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Forms: ( 0 1 0) ( 1 1 0) ( 1 3 1) ( 0 3 1)

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Crystal Structure:

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Hill R J , Jones J B , American Mineralogist , 61 (1976) p.987-995, The crystal structure of hopeite

Physical Properties of Hopeite

Cleavage:

{100} Perfect, {010} Good, {001} Poor

Color:

Colorless, Gray white, Yellow, White, Light yellow.

Density:

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hopeite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.187,KPDmeas= 0.1945,KC= 0.1944
Ncalc = 1.58 - 1.61

Optical Data:

Biaxial (-), a=1.572-1.574, b=1.582-1.591, g=1.59-1.592, bire=0.0180, 2V(Calc)=26-82, 2V(Meas)=0-36. Dispersion none.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Hopeite

Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Hopeite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Hopeite= 21.64 barns/electron
U=PE_Hopeite x rElectron Density= 63.47 barns/cc.

Radioactivity:

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

Hopeite Classification

Dana Class:

40.03.04.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 · x(H2O)

(40.03.04)Hopeite Group

40.03.04.01 Hopeite Zn3(PO4)2•4(H2O) P nma 2/m 2/m 2/m

40.03.04.02 Rollandite! Cu3(AsO4)2•4(H2O) P nma 2/m 2/m 2/m

Strunz Class:

08.CA.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CA -With small and large/medium cations

08.CA.30 Hopeite Zn3(PO4)2•4(H2O) P nma 2/m 2/m 2/m

Other Hopeite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Hopeite :
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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Ask about Hopeite 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 Hopeite Specimen Label here :

Hopeite

Zn3(PO4)2•4(H2O)
Dana No: 40.03.04.01 Strunz No: 08.CA.30
Locality:

Notes: