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:

Found in granular ore in a metamorphosed stratiform zinc deposit.

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

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

Name Origin:

Named for the Hardyston Township in which Franklin is situated.

Name Pronunciation:

Hardystonite + Pronunciation

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

Diaphaneity:

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:

Fluorescent, Short UV=dark purple, Long UV=intense violet-blue.

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
Ncalc = 1.67

Optical Data:

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

Calculated Properties of Hardystonite

Electron Density:

Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Hardystonite =3.40 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Hardystonite= 14.02 barns/electron
U=PE_Hardystonite x rElectron Density= 46.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hardystonite is Not Radioactive

Hardystonite Classification

Dana Class:

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

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

(55.04.02)Fresnoite group

55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.04.02.02 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

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

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

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

55.04.02.06 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

Strunz Class:

09.BB.10 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BB -Si2O7 groups, without non-tetrahedral anions;

09.BB.10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

09.BB.10 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

09.BB.10 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

09.BB.10 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

09.BB.10 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

09.BB.10 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

09.BB.10 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 42₁m 4 2m

09.BB.10 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

Other Hardystonite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Hardystonite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Hardystonite

Ca2ZnSi2O7
Dana No: 55.04.02.02 Strunz No: 09.BB.10
Locality:

Notes: