Junitoite Mineral Data

Junitoite Mineral Data +

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General Junitoite Information

Chemical Formula:

CaZn2Si2O7·(H2O)

Composition:

Molecular Weight = 357.04 gm

Calcium 11.23 % Ca 15.71 % CaO

Zinc 36.63 % Zn 45.59 % ZnO

Silicon 15.73 % Si 33.66 % SiO₂

Hydrogen 0.56 % H 5.05 % H₂O

Oxygen 35.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaZn₂Si₂O₇·(H₂O)

IMA Status:

Approved IMA 1976

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 40526

PDF 29-394

Junitoite Image

Images:

Junitoite

Comments: Platy transparent junitoite crystal cluster lying flat on white limestone matrix.
Location: Christmas Mine, near Hayden, Gila County, Arizona. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Junitoite

Comments: Clear, platy, flat lying crystals of junitoite (red marker) to 2mm associated with lavender smectite.
Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Junitoite Crystallography

Axial Ratios:

a:b:c =0.5045:1:0.6837

Cell Dimensions:

a = 6.309, b = 12.503, c = 8.549, Z = 4; V = 674.36 Den(Calc)= 3.52

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Bbm2

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

By Intensity(I/I_o): 2.54(1), 2.816(1), 3.528(1),

Crystal Structure:

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Hamilton R D , Finney J J , Mineralogical Magazine , 49 (1985) p.91-95, The structure of junitoite, CaZn2Si2O7*H2O, Locality: Christmas mine, Gile County, Arizona, USA

Physical Properties of Junitoite

Cleavage:

[010] Good

Color:

Colorless, White.

Density:

3.5

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Junitoite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1886,KPDmeas= 0.1897,KC= 0.1922

Optical Data:

Biaxial (?), a=1.656, b=1.664, g=1.672, bire=0.0160, 2V(Calc)=88, 2V(Meas)=86.

Calculated Properties of Junitoite

Electron Density:

r_electron=3.41 gm/cc
note: r_Junitoite=3.50 gm/cc.

Fermion Index

Fermion Index = 0.02268
Boson Index = 0.97732

Photoelectric:

PE_Junitoite= 20.00 barns/electron
U=PE_Junitoite x r_electron= 68.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Junitoite is Not Radioactive

Junitoite Classification

Dana Class:

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

(56.2)with cations in [4] and/or >[4] coordination

(56.2.1)Dana Group

56.2.1.1 Junitoite CaZn2Si2O7·(H2O) Bbm2 mm2

Strunz Class:

VIII/C.08-20 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 Junitoite Information

References:

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

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

Junitoite

CaZn2Si2O7·(H2O)
Dana No: 56.2.1.1 Strunz No: VIII/C.08-20
Locality:

Notes: