Hardystonite Mineral Data

Hardystonite Mineral Data +

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General Hardystonite Information

Chemical Formula:

Ca2ZnSi2O7

Composition:

Molecular Weight = 313.71 gm

Calcium 25.55 % Ca 35.75 % CaO

Zinc 20.84 % Zn 25.94 % ZnO

Silicon 17.91 % Si 38.31 % SiO₂

Oxygen 35.70 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂ZnSi₂O₇

Environment:

Metamorphosed zinc deposits.

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Synonym:

ICSD 18114

PDF 35-745

Hardystonite Image

Images:

Click Here for Larger Hardystonite Image

Hardystonite Esperite Franklinite

Comments: Pale brown porcelaneous esperite with pinkish gray hardystonite and black franklinite.
Location: Franklin, Sussex County, New Jersey. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hardystonite Crystallography

Axial Ratios:

a:c = 1:0.6408

Cell Dimensions:

a = 7.823, c = 5.013, Z = 2; V = 306.79 Den(Calc)= 3.40

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 42₁m

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

By Intensity(I/I_o): 2.868(1), 3.085(0.6), 3.711(0.5),

Crystal Structure:

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Bindi L , Bonazzi P , Rothlisberger F , American Mineralogist , 86 (2001) p.747-751, Hardystonite from Franklin Furnace: A natural modulated melilite

View Additional jPOWD Structure files for Hardystonite
[1]

Physical Properties of Hardystonite

Cleavage:

[100] Perfect, [110] Fair

Color:

White, Light brown, Pink.

Density:

3.4

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hardystonite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.196,KPDmeas= 0.196,KC= 0.1957

Optical Data:

Uniaxial (-), e=1.661, w=1.672, bire=0.0110.

Calculated Properties of Hardystonite

Electron Density:

r_electron=3.34 gm/cc
note: r_Hardystonite=3.40 gm/cc.

Fermion Index

Fermion Index = 0.01742
Boson Index = 0.98258

Photoelectric:

PE_Hardystonite= 14.02 barns/electron
U=PE_Hardystonite x r_electron= 46.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hardystonite is Not Radioactive

Hardystonite Classification

Dana Class:

55.4.2.2 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.4)with cations in [8] and lower coordination

(55.4.2)Fresnoite group

55.4.2.1 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.4.2.2 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

55.4.2.3 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

55.4.2.4 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

55.4.2.5 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

55.4.2.6 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

Strunz Class:

VIII/C.02-40 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.02 - Melilite group

VIII/C.02-10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

VIII/C.02-14 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

VIII/C.02-15 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

VIII/C.02-30 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

VIII/C.02-40 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

VIII/C.02-50 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

VIII/C.02-60 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

VIII/C.02-70 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

VIII/C.02-80 Barylite BaBe2Si2O7 Pn21a mm2

VIII/C.02-85 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

VIII/C.02-90 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

Other Hardystonite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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

Hardystonite

Ca2ZnSi2O7
Dana No: 55.4.2.2 Strunz No: VIII/C.02-40
Locality:

Notes: