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Hardystonite

Big Photo

Lichtloch 25, Gottesbelohnung smelter (slag locality), Hettstedt, Mansfeld Basin, Saxony-Anhalt, Germany
© Frank de Wit

Show Hardystonite Photos (18)
Formula:
Ca
 
2
Zn[Si
 
2
O
 
7
]
System:TetragonalColour:light brownish white, ...
Hardness:3 - 4
Name:After Hardyston Township, New Jersey, USA, locality of the Franklin orebody prior to incorporation of Franklin Borough in 1913.


In daylight, hardystonite is a very non-descript massive mineral distinguished from massive calcite by a lack of cleavage and a somewhat greasy luster.

Classification of Hardystonite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.02-40
Nickel-Strunz 10th (pending) edition ID:9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID:55.4.2.2

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
Hey's CIM Ref.:14.7.14

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

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1899
Geological Setting of type material:Occurs in a metamorphosed zinc-manganese-iron silicate-oxide orebody.

Physical Properties of Hardystonite

Lustre:Adamantine, Resinous, Dull
Diaphaneity (Transparency):Opaque
Colour:light brownish white, pale greyish-white, whitish, very pale pinkish
Streak:white
Hardness (Mohs):3 - 4
Cleavage:Distinct/Good

Crystallography of Hardystonite

Crystal System:Tetragonal
Cell Parameters:a = 7.82Å, c = 5.01Å
Ratio:a:c = 1 : 0.641
Unit Cell Volume:V 306.37 ų (Calculated from Unit Cell)
Morphology:Large, rough crystals rare embedded in calcite or other matrix.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Hardystonite

Type:Uniaxial (-)
RI values: nω = 1.672 nε = 1.661
Maximum Birefringence:δ = 0.011

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

Chemical Properties of Hardystonite

Formula:
Ca
 
2
Zn[Si
 
2
O
 
7
]
Essential elements:Ca, O, Si, Zn
All elements listed in formula:Ca, O, Si, Zn
Analyical Data:Often replaced by, or being replaced by esperite. The latter condition very apparent under UV light as whisps and veils of esperite invading the hardystonite.
Common Impurities:Al,Fe,Mn,Pb,Mg,Na
Relationship of Hardystonite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
9.BB.10Åkermanite
Ca
 
2
Mg[Si
 
2
O
 
7
]
9.BB.10Cebollite
Ca
 
5
Al
 
2
Si
 
3
O
 
12
(OH)
 
4
 or near
9.BB.10Gehlenite
Ca
 
2
Al[AlSiO
 
7
]
9.BB.10Gugiaite
Ca
 
2
Be[Si
 
2
O
 
7
]
9.BB.10Jeffreyite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(O,OH)]
9.BB.10Okayamalite
Ca
 
2
B[BSiO
 
7
]
9.BB.15Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
9.BB.15Clinobarylite
BaBe
 
2
Si
 
2
O
 
7
9.BB.20Andrémeyerite
BaFe
2+
2
[Si
 
2
O
 
7
]
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
14.7.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
14.7.16Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
14.7.17Junitoite
CaZn
 
2
[Si
 
2
O
 
7
] · 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 Hardystonite
Other Languages:
German:Hardystonit
Russian:Гардистонит
Spanish:Hardystonita
Other Information
Fluorescence in UV light:Dull persistent purple to blue (SW UV); blue (LW UV).
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:None
References for Hardystonite
Reference List:Palache, C. (1935), USGS PP 180: 94.



Dunn, Pete J. (1995): Pt3: 411-412.



Zeitschrift für Kristallographie: 130: 427-437.


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    Localities for Hardystonite
     		

    (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.

    Germany
     
    

    • Saxony-Anhalt
    

      • Mansfeld Basin
    

        • Hettstedt
    

          • Gottesbelohnung smelter (slag locality)
    

    USA
     
    

    • New Jersey
    

      • Sussex Co.
    

        • Franklin Mining District
    

          • Franklin
    
    		Palache(1935):94; Dunn(1995):Pt3:411-412.
    

    


    

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