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Junitoite

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Christmas Mine (Red Bird shafts; Inspiration Mine; Hackberry shafts), Christmas, Christmas area, Banner District, Dripping Spring Mts, Gila Co., Arizona, USA
© Wm. Wise

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Formula:
CaZn
 
2
[Si
 
2
O
 
7
] · H
 
2
O
System:OrthorhombicColour:colourless
Hardness:4½
This page provides mineralogical data about Junitoite.

Classification of Junitoite

IMA status:Approved
Strunz 8th edition ID:8/C.08-20
Nickel-Strunz 10th (pending) edition ID:9.BD.15

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID: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
Hey's CIM Ref.:14.7.17

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

Type Locality:Christmas Mine (Red Bird shafts; Inspiration Mine; Hackberry shafts), Christmas, Christmas area, Banner District, Dripping Spring Mts, Gila Co., Arizona, USA
Year of Discovery:1976

Physical Properties of Junitoite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:colourless
Hardness (Mohs):4½
Cleavage:Distinct/Good
{010} good.
Density (measured):3.5 g/cm3

Crystallography of Junitoite

Crystal System:Orthorhombic
Cell Parameters:a = 12.51Å, b = 6.31Å, c = 8.56Å
Ratio:a:b:c = 1.983 : 1 : 1.357
Unit Cell Volume:V 675.71 ų (Calculated from Unit Cell)
Morphology:Crystals to 5mm with hemimorphic development.

Optical Data of Junitoite

Type:Biaxial
RI values: nα = 1.656 nβ = 1.664 nγ = 1.672
2V:Measured: 86° , Calculated: 88°
Maximum Birefringence:δ = 0.016

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v

Chemical Properties of Junitoite

Formula:
CaZn
 
2
[Si
 
2
O
 
7
] · H
 
2
O
Essential elements:Ca, H, O, Si, Zn
All elements listed in formula:Ca, H, O, Si, Zn

Relationship of Junitoite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.BD.05Bertrandite
Be
 
4
[(OH)
 
2
|Si
 
2
O
 
7
]
9.BD.10Hemimorphite
Zn
 
4
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
9.BD.20Axinite-(Fe)
Ca
 
2
Fe
2+
 
Al
 
2
[OH|BSi
 
4
O
 
15
]
9.BD.20Axinite-(Mg)
Ca
 
2
MgAl
 
2
[OH|BSi
 
4
O
 
15
]
9.BD.20Axinite-(Mn)
Ca
 
2
Mn
2+
 
Al
 
2
[OH|BSi
 
4
O
 
15
]
9.BD.20Tinzenite
(Ca,Mn
2+
 
,Fe
2+
 
)
 
3
Al
 
2
[OH|BSi
 
4
O
 
15
]
9.BD.25Vistepite
SnMn
 
4
B
 
2
Si
 
4
O
 
16
(OH)
 
2
9.BD.30Boralsilite
Al
 
16
B
 
6
Si
 
2
O
 
27
9.BD.35Werdingite
(Mg,Fe)
 
2
Al
 
14
Si
 
4
B
 
4
O
 
37
Related Minerals - Hey's Index Grouping:
14.7.1Sanbornite
Ba
 
2
[Si
 
4
O
 
10
]
14.7.2Krauskopfite
BaSi
 
2
O
 
5
·3H
 
2
O
14.7.3Walstromite
BaCa
 
2
[Si
 
3
O
 
9
]
14.7.4Macdonaldite
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
·10H
 
2
O
14.7.5Ericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.6Orthoericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.7Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
14.7.8Andrémeyerite
BaFe
2+
2
[Si
 
2
O
 
7
]
14.7.9Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
14.7.10Taikanite
Sr
 
3
BaMn
2+
2
[O|Si
 
2
O
 
6
]
 
2
14.7.11Willemite
Zn
 
2
[SiO
 
4
]
14.7.12Hemimorphite
Zn
 
4
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
14.7.13Zincsilite
Zn
 
3
Si
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
14.7.14Hardystonite
Ca
 
2
Zn[Si
 
2
O
 
7
]
14.7.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
14.7.16Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
14.7.18Larsenite
PbZn[SiO
 
4
]
14.7.19Esperite
PbCa
 
3
Zn
 
4
[SiO
 
4
]
 
4
14.7.20Hodgkinsonite
Mn
2+
 
Zn
 
2
[(OH)
 
2
|SiO
 
4
]
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn[(OH)
 
2
|SiO
 
4
]
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
FeMn
 
3
MnZn
 
2
Si
 
2
O
 
10
(OH)
 
8

Other Names for Junitoite

Synonyms:
IMA1975-042
German names:
Junitoit
Russian names:
Джунитоит
Spanish names:
Junitoita

Other Information

Thermal Behaviour:Strongly pyroelectric.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Junitoite

Reference List:American Mineralogist (1976): 61: 1255-1258.

Mineralogical Magazine (1985): 49: 91.

Internet Links for Junitoite

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    Localities for Junitoite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • 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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