Hemimorphite Mineral Data

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General Hemimorphite Information

Chemical Formula:

Zn4Si2O7(OH)2•(H2O)

Composition:

Molecular Weight = 481.76 gm

Zinc 54.29 % Zn 67.58 % ZnO

Silicon 11.66 % Si 24.94 % SiO₂

Hydrogen 0.84 % H 7.48 % H₂O

Oxygen 33.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₄Si₂O₇(OH)₂•(H₂O)

Environment:

Veins and beds in stratified calcareous rocks.

IMA Status:

Valid Species (Pre-IMA) 1853

Locality:

Nerchinak in Transbaikalia, Siberia. Link to MinDat.org Location Data.

Name Origin:

Named after the hemimorphic nature of the crystals.

Name Pronunciation:

Hemimorphite + Pronunciation

Synonym:

Calamine

Galmei

ICSD 30012

PDF 5-555

Zinc silicate

Hemimorphite Image

Images:

Hemimorphite

Comments: Lustrous, mostly colorless to slightly reddish-brown hemimorphite crystals, the largest 13 x 20 x 2 mm in size.
Location: Santa Eulalia, Chihuahua, Mexico. Scale: 25 x 10 x 25 mm.
© Dan Weinrich

Hemimorphite Crystallography

Axial Ratios:

a:b:c =0.7808:1:0.4776

Cell Dimensions:

a = 8.37, b = 10.719, c = 5.12, Z = 2; V = 459.36 Den(Calc)= 3.48

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Imm2

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

By Intensity(I/I_o): 3.104(1), 6.6(0.86), 3.288(0.75),

Forms:

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Forms: ( 3 0 1) ( 1 0 0) ( 0 1 0) ( 1 1 0) ( 0 3 1) ( 1 2 1) ( 0 0 1)

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Crystal Structure:

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Libowitzky E , Kohler T , Armbruster T , Rossman G R , European Journal of Mineralogy , 9 (1997) p.803-810, Proton disorder in dehydrated hemimorphite - IR spectroscopy, and X-ray structure refinement at low and ambient temperatures, T = 110 K

View Additional jPOWD Structure files for Hemimorphite
[1] [2] [3] [4]

Physical Properties of Hemimorphite

Cleavage:

{110} Perfect

Color:

Brown, Colorless, Greenish gray, Yellow brown, White.

Density:

3.4 - 3.5, Average = 3.45

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

5 - Apatite

Luminescence:

Fluorescent, Short UV=dull white, Long UV=dull white.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hemimorphite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1788,KPDmeas= 0.1804,KC= 0.1841
Ncalc = 1.63 - 1.64

Optical Data:

Biaxial (+), a=1.614, b=1.617, g=1.636, bire=0.0220, 2V(Calc)=44, 2V(Meas)=46. Dispersion none.

Calculated Properties of Hemimorphite

Electron Density:

Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Hemimorphite =3.45 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Hemimorphite= 27.43 barns/electron
U=PE_Hemimorphite x rElectron Density= 91.14 barns/cc.

Radioactivity:

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

Hemimorphite Classification

Dana Class:

56.01.02.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.01)with cations in [4] coordination

(56.01.02)Dana Group

56.01.02.01 Hemimorphite Zn4Si2O7(OH)2•(H2O) Imm2 mm2

Strunz Class:

09.BD.10 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BD -Si2O7 groups with additional anions;

09.BD.10 Hemimorphite Zn4Si2O7(OH)2•(H2O) Imm2 mm2

Other Hemimorphite Information

References:

NAME( Mason68) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Mason68)

See Also:

Links to other databases for Hemimorphite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Glendale Community College
11 - Google Images
12 - Google Scholar
13 - Handbook of Mineralogy (MinSocAm)
14 - Handbook of Mineralogy (UofA)
15 - MinDAT
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - WWW-MINCRYST
21 - YupRocks

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

Hemimorphite

Zn4Si2O7(OH)2•(H2O)
Dana No: 56.01.02.01 Strunz No: 09.BD.10
Locality:

Notes: