Mineralogy Database

Willemite Mineral Data

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General Willemite Information

Help on Chemical  Formula: Chemical Formula: Zn2SiO4
Help on Composition: Composition: Molecular Weight = 222.86 gm
   Zinc     58.68 %  Zn   73.04 % ZnO
   Silicon  12.60 %  Si   26.96 % SiO2
   Oxygen   28.72 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn2(SiO4)
Help on Environment: Environment: Main ore mineral at Franklin, a metamorphosed zinc orebody.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1830
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: After Willem I, King of the Netherlands (1772-1843).
Help on Name Pronunciation: Name Pronunciation: Willemite + Pronunciation Say WILLEMITE
Help on Synonym: Synonym: ICSD 2425
  PDF 46-1316

Willemite Image

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  Conichalcite   Willemite

Comments: Conichalcite with willemite.
Location: Collected from the 30 level of the Tsumeb mine. Tsumeb, Namibia. Scale: 2.1 x 1.5 cm.
© John Veevaert

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Comments: Sky blue botryoidal willemite with dark to white dolomite.
Location: Tsumeb Mine, Namibia. Scale: 6 x 3 cm.
© John Veevaert

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Comments: Specimen of blocky willemite crystals. The lower picture shows willemite under SW UV light.
Location: Franklin, New Jersey, USA. Scale: 2.8 x 2.3 cm..
© John Veevaert

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  Glaucochroite   Zincite   Willemite

Comments: Pinkish gray crystalline glaucochroite intermixed with pale green willemite, with dark red zincite and white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Willemite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.66786
Help on Cell Dimensions: Cell Dimensions: a = 13.94, c = 9.31, Z = 18; V = 1,566.77 Den(Calc)= 4.25
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.634(1), 2.834(0.95), 3.486(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 1 1 2)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Willemite

Help on Cleavage: Cleavage: {0001} Poor, {1120} Poor
Help on Color: Color: White, Yellow, Green, Reddish brown, Black.
Help on Density: Density: 3.9 - 4.2, Average = 4.05
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Fluorescent and phosphorescent, Short UV=green, Long UV=green.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Willemite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1682,KPDmeas= 0.1765,KC= 0.1715
Ncalc = 1.67 - 1.73
Help on Optical Data: Optical Data: Uniaxial (+), w=1.691-1.72, e=1.719-1.73, bire=0.0100-0.0280.

Calculated Properties of Willemite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.04 gm/cc
note: Specific Gravity of Willemite =4.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEWillemite = 29.98 barns/electron
U=PEWillemite x rElectron Density= 121.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Willemite is Not Radioactive

Willemite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.01)with cations in [4] coordination
  (51.01.01)Phenakite group Phenakite Be2SiO4 R 3 3 Willemite Zn2SiO4 R 3 3 Eucryptite LiAlSiO4 R 3 3
Help on  Strunz Class: Strunz Class: 09.AA.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AA -Nesosilicates without additional anions;
09.AA.05 Eucryptite LiAlSiO4 R 3 3
09.AA.05 Phenakite Be2SiO4 R 3 3
09.AA.05 Willemite Zn2SiO4 R 3 3

Other Willemite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Willemite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - Franklin Minerals(Palache)
11 - GeoScienceWorld
12 - Google Images
13 - Google Scholar
14 - Handbook of Mineralogy (MinSocAm)
15 - Handbook of Mineralogy (UofA)
16 - HyperPhysics
17 - MinDAT
18 - Mineralienatlas (Deutsch)
19 - Minerals of Franklin and Sterling Hill
20 - Online Mineral Museum
21 - Philatelic Mineralogy
22 - QUT Mineral Atlas
23 - Ruff.Info
24 - University of Colorado - Mineral Structure Data
26 - YupRocks
27 - theimage

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Dana No: Strunz No: 09.AA.05





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