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Junitoite

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Jun Ito
Formula:
CaZn2Si2O7 · H2O
Colour:
colorless
Lustre:
Adamantine, Vitreous, Sub-Vitreous
Hardness:
Specific Gravity:
3.5
Crystal System:
Orthorhombic
Name:
Named by Sidney Arthur Williams in 1976 in honor of Jun Ito [September 25, 1926 Japan - June 6, 1978 Chicago, IL], mineralogist and crystallographer, University of Chicago, Chicago, IL, USA.
This page provides mineralogical data about Junitoite.


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Classification of JunitoiteHide

Approved
9.BD.15

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.2.1.1

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
14.7.17

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Physical Properties of JunitoiteHide

Adamantine, Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
colorless
Comment:
sometimes milky white to pale lavender due to alteration
Streak:
Colorless
Hardness:
4½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
Very Good
{010} very good,{100} and {101} are poor.
Fracture:
Micaceous
Comment:
Breaks somewhat like mica in that the plates separate easily by breaking using a sharp point.
Density:
3.5 g/cm3 (Measured)    

Optical Data of JunitoiteHide

Type:
Biaxial (+)
RI values:
nα = 1.656 nβ = 1.664 nγ = 1.672
2V:
Measured: 86° , Calculated: 88°
Birefringence:
0.016
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v
Pleochroism:
Non-pleochroic

Chemical Properties of JunitoiteHide

Formula:
CaZn2Si2O7 · H2O

Crystallography of JunitoiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 12.51 Å, b = 6.31 Å, c = 8.56 Å
Ratio:
a:b:c = 1.983 : 1 : 1.357
Unit Cell V:
675.71 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals to 5mm with hemimorphic development. c {001}, b {010}, k {101}, p {111}, r {131}, -r {13-1}, -g {19-1}. (Viscinal forms may show herringbone pattern ["whishbone"])
Comment:
Cell re-set from original

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.25 (40)
4.70 (50)
3.53 (100)
2.82 (100)
2.54 (100)
2.52 (50)
2.35 (70)
1.540 (60)
Comments:
ICDD 29-394

Type Occurrence of JunitoiteHide

General Appearance of Type Material:
Randomly oriented colorless to lavender platy crystals up to 5 x 0.5 mm.
Geological Setting of Type Material:
Contact metamorphosed zinc orebody
Associated Minerals at Type Locality:

Synonyms of JunitoiteHide

Other Language Names for JunitoiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kinoite6 photos of Junitoite associated with Kinoite on mindat.org.
Dioptase4 photos of Junitoite associated with Dioptase on mindat.org.
Smectite Group3 photos of Junitoite associated with Smectite Group on mindat.org.
Chalcanthite2 photos of Junitoite associated with Chalcanthite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BD.05BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
9.BD.20Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
9.BD.20Axinite-(Mg)Ca2MgAl2BSi4O15OHTric.
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
9.BD.20TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
9.BD.25VistepiteSnMn4B2Si4O16(OH)2Tric. 1
9.BD.30BoralsiliteAl16B6Si2O37Mon. 2/m : B2/m
9.BD.35Werdingite(Mg,Fe)2Al14Si4B4O37Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.1SanborniteBa2(Si4O10)Orth.
14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.3WalstromiteBaCa2(Si3O9)Tric.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.6Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
14.7.7GillespiteBaFe2+Si4O10Tet.
14.7.8AndrémeyeriteBaFe2+2(Si2O7)Mon.
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17Orth.
14.7.10TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon.
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/m
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2Orth.
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

Fluorescence of JunitoiteHide

Not fluorescent

Other InformationHide

Thermal Behaviour:
Strongly 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.

References for JunitoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1976): 61: 1255-1258.
Mineralogical Magazine (1985): 49: 91.

Internet Links for JunitoiteHide

Localities for JunitoiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Arizona
    • Gila Co.
      • Dripping Spring Mts
        • Banner District
          • Christmas area
            • Christmas
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 231.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 264; Williams, S.A. (1976), Junitoite, a new hydrated calcium zinc silicate from Christmas, AZ, Am.Min.: 61: 1255-1258.
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Dunn(1995):Pt3:414.
Mineral and/or Locality  
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