Hemimorphite Mineral Data

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.

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),

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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

Diaphaniety:

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:

None.

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

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:

r_electron=3.32 gm/cc
note: r_Hemimorphite=3.45 gm/cc.

Fermion Index

Fermion Index = 0.02786
Boson Index = 0.97214

Photoelectric:

PE_Hemimorphite= 27.43 barns/electron
U=PE_Hemimorphite x r_electron= 91.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hemimorphite is Not Radioactive

Hemimorphite Classification

Dana Class:

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

(56.1)with cations in [4] coordination

(56.1.2)Dana Group

56.1.2.1 Hemimorphite Zn4Si2O7(OH)2·(H2O) Imm2 mm2

Strunz Class:

VIII/C.08-10 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.08 - Hemimorphite - Junitoite series

VIII/C.08-10 Hemimorphite Zn4Si2O7(OH)2·(H2O) Imm2 mm2

VIII/C.08-20 Junitoite CaZn2Si2O7·(H2O) Bbm2 mm2

Other Hemimorphite Information

References:

NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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Hemimorphite

Zn4Si2O7(OH)2·(H2O)
Dana No: 56.1.2.1 Strunz No: VIII/C.08-10
Locality:

Notes: