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Hemimorphite

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Formula:
Zn4Si2O7(OH)2 · H2O
System:
Orthorhombic
Colour:
Colorless, white, pale ...
Hardness:
4½ - 5
Name:
Named in 1853 by Adolph Kenngott in allusion to the hemimorphic morphology of the crystals. Many names were assigned to this species previously including calamine.

Classification of Hemimorphite

Approved
9.BD.10

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.1.2.1

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
1 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
14.7.12

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
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First Recorded Occurrence of Hemimorphite

Year of Discovery:
1853

Occurrences of Hemimorphite

Geological Setting:
Secondary mineral in the weathered portions of zinc deposits.

Physical Properties of Hemimorphite

Adamantine, Vitreous, Silky, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colorless, white, pale blue, pale green, gray, brown
Streak:
White
Hardness (Mohs):
4½ - 5
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {110}, poor on {101}, {001} rare
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.475 g/cm3 (Measured)    3.484 g/cm3 (Calculated)

Crystallography of Hemimorphite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Imm2
Cell Parameters:
a = 8.367(5) Å, b = 10.73Å, c = 5.155(3) Å
Ratio:
a:b:c = 0.78 : 1 : 0.48
Unit Cell Volume:
V 462.81 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Thin tabular crystals, sheaf-like or fan-like aggregates, stalagtitic, mammillary, botryoidal.
Twinning:
On {101} rare

Crystallographic forms of Hemimorphite

Crystal Atlas:
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Hemimorphite no.2 - Goldschmidt (1913-1926)
Hemimorphite no.33 - Goldschmidt (1913-1926)
Hemimorphite no.91 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Hemimorphite

Type:
Biaxial (+)
RI values:
nα = 1.614 nβ = 1.617 nγ = 1.636
2V:
Measured: 46° , Calculated: 44°
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong r > v

Chemical Properties of Hemimorphite

Formula:
Zn4Si2O7(OH)2 · H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Cu,Fe

Relationship of Hemimorphite to other Species

9.BD.05BertranditeBe4(Si2O7)(OH)2
9.BD.15JunitoiteCaZn2Si2O7 · H2O
9.BD.20Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
9.BD.20Axinite-(Mg)Ca2MgAl2BSi4O15OH
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
9.BD.20Tinzenite(CaMn2+)2Mn2+Al2BSi4O15(OH)
9.BD.25VistepiteSnMn4B2Si4O16(OH)2
9.BD.30BoralsiliteAl16B6Si2O37
9.BD.35Werdingite(Mg,Fe)2Al14Si4B4O37
14.7.1SanborniteBa2(Si4O10)
14.7.2KrauskopfiteBaSi2O5 · 3H2O
14.7.3WalstromiteBaCa2(Si3O9)
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2O
14.7.5EricssoniteBaMn22+Fe3+(Si2O7)O(OH)
14.7.6Ericssonite-2OBaMn22+Fe3+(Si2O7)O(OH)
14.7.7GillespiteBaFe2+[Si4O10]
14.7.8AndrémeyeriteBaFe22+(Si2O7)
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17
14.7.10TaikaniteSr3BaMn22+(Si4O12)O2
14.7.11WillemiteZn2SiO4
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
14.7.14HardystoniteCa2Zn(Si2O7)
14.7.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
14.7.16ClinohedriteCaZn(SiO4) · H2O
14.7.17JunitoiteCaZn2Si2O7 · H2O
14.7.18LarsenitePbZnSiO4
14.7.19EsperitePbCa2Zn3(SiO4)3
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2
14.7.22GageiteMn21(Si4O12)2O3(OH)20
14.7.23FranklinfurnaceiteCa2Fe3+Mn32+Mn3+(Zn2Si2O10)(OH)8

Other Names for Hemimorphite

Other Information

May be bluish under SW UV.
Electrical:
Pyroelectric
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Ore of zinc.

References for Hemimorphite

Reference List:
Zeitschrift für Kristallographie: 159: 47-48.

Zeitschrift für Kristallographie: 146: 241-259.

European Journal of Mineralogy: 9: 803-810.

Internet Links for Hemimorphite

Specimens:
The following Hemimorphite specimens are currently listed for sale on minfind.com.

Localities for Hemimorphite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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