Jervisite Mineral Data

Jervisite Mineral Data +

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General Jervisite Information

Chemical Formula:

(Na,Ca,Fe++)(Sc,Mg,Fe++)Si2O6

Composition:

Molecular Weight = 223.42 gm

Sodium 6.17 % Na 8.32 % Na₂O

Calcium 5.38 % Ca 7.53 % CaO

Magnesium 3.26 % Mg 5.41 % MgO

Scandium 12.07 % Sc 18.52 % Sc₂O₃

Iron 5.00 % Fe 6.43 % FeO

Silicon 25.14 % Si 53.79 % SiO₂

Oxygen 42.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ca_0.3Fe²⁺_0.2Sc_0.6Mg_0.3Si₂O₆

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 14263

PDF 35-542

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Jervisite Crystallography

Axial Ratios:

a:b:c =1.0896:1:0.5874

Cell Dimensions:

a = 9.853, b = 9.042, c = 5.312, Z = 4; beta = 106.62° V = 453.48 Den(Calc)= 3.27

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.038(1), 2.543(0.75), 2.979(0.75),

Physical Properties of Jervisite

Cleavage:

[110] Perfect

Color:

Light green.

Density:

3.22

Diaphaniety:

Transparent to Translucent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Jervisite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2163,KPDmeas= 0.2197,KC= 0.214

Optical Data:

Biaxial (-), a=1.683, b=1.715, g=1.724, bire=0.0410

Calculated Properties of Jervisite

Electron Density:

r_electron=3.22 gm/cc
note: r_Jervisite=3.27 gm/cc.

Fermion Index

Fermion Index = 0.01634
Boson Index = 0.98366

Photoelectric:

PE_Jervisite= 4.97 barns/electron
U=PE_Jervisite x r_electron= 15.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jervisite is Not Radioactive

Jervisite Classification

Dana Class:

65.1.3c.6 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.3c)C2/c clinopyroxenes (Na clinopyroxenes)

65.1.3c.1 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.1.3c.2 Aegirine NaFeSi2O6 C 2/c 2/m

65.1.3c.3 Namansilite NaMn(Si2O6) C 2/c 2/m

65.1.3c.4 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.1.3c.5 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.1.3c.6 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

VIII/F.01-150 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.01 - Pyroxene group, Clinopyroxene

VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m

VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m

VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m

VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m

VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m

VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m

VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m

VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m

Other Jervisite Information

References:

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

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Jervisite

(Na,Ca,Fe++)(Sc,Mg,Fe++)Si2O6
Dana No: 65.1.3c.6 Strunz No: VIII/F.01-150
Locality:

Notes: