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

Environment:

In miarolitic cavities in granite.

IMA Status:

Approved IMA 1982

Locality:

In the Diverio quarry, Mt. Mottarone, near Baveno, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for William P. Jervis, Curator of the Museo Industriale Italiano di Torino, Torino, Italy.

Name Pronunciation:

Jervisite + Pronunciation

Synonym:

ICSD 14263

PDF 35-542

Jervisite Image

Images:

Jervisite Cascandite

Comments: White, acicular jervisite crystals and pink cascandite crystals.
Location: Seula min,, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy. Scale: Crystal Size 1 mm.
© Sergio Varvello / Mineral Service

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),

Crystal Structure:

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Hawthorne F C , Grundy H D , Acta Crystallographica, Section B , 29 (1973) p.2615-2616, Refinement of the crystal structure of NaScSi2O6, Locality: synthetic

Physical Properties of Jervisite

Cleavage:

{110} Perfect

Color:

Light green.

Density:

3.22

Diaphaneity:

Transparent to Translucent

Habit:

Platy - Sheet forms (e.g. micas).

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
Ncalc = 1.69 - 1.7

Optical Data:

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

Calculated Properties of Jervisite

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Jervisite =3.27 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Jervisite= 4.97 barns/electron
U=PE_Jervisite x rElectron Density= 15.99 barns/cc.

Radioactivity:

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

Jervisite Classification

Dana Class:

65.01.03c.06 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03c)C2/c clinopyroxenes (Na clinopyroxenes)

65.01.03c.01 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.01.03c.02 Aegirine NaFeSi2O6 C 2/c 2/m

65.01.03c.03 Namansilite NaMn(Si2O6) C 2/c 2/m

65.01.03c.04 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.01.03c.05 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.01.03c.06 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

09.DA.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.25 Aegirine NaFeSi2O6 C 2/c 2/m

09.DA.25 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

09.DA.25 Kosmochlor NaCrSi2O6 C 2/c 2/m

09.DA.25 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

09.DA.25 Namansilite NaMn(Si2O6) C 2/c 2/m

09.DA.25 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

Other Jervisite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Jervisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Jervisite

(Na,Ca,Fe++)(Sc,Mg,Fe++)Si2O6
Dana No: 65.01.03c.06 Strunz No: 09.DA.25
Locality:

Notes: