Mineralogy Database

Jonesite Mineral Data

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General Jonesite Information

Help on Chemical  Formula: Chemical Formula: Ba2(K,Na)[Ti2(Si5Al)O18•n(H2O)
Help on Composition: Composition: Molecular Weight = 914.93 gm
   Potassium   3.21 %  K     3.86 % K2O
   Barium     30.02 %  Ba   33.52 % BaO
   Sodium      0.63 %  Na    0.85 % Na2O
   Titanium   10.47 %  Ti   17.46 % TiO2
   Aluminum    2.95 %  Al    5.57 % Al2O3
   Silicon    15.35 %  Si   32.84 % SiO2
   Hydrogen    0.66 %  H     5.91 % H2O
   Oxygen     36.72 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba2K0.75Na0.25Ti2Si5AlO18•3(H2O)
Help on Environment: Environment: In fractures and cavities of brecciated greenstone enclosed in blueschist associated with neptunite and joaquinite.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Dallas Gem Mine (Gem Mine; Benitoite Mine), New Idria District, San Benito Co., California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francis Tucker Jones (1905-1993), Research Chemical Microscopist of Berkeley, California, USA, who discovered the mineral
Help on Name Pronunciation: Name Pronunciation: Jonesite Say JONESITE

Jonesite Image

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Comments: Transparent, bladed crystal of jonesite on matrix.
Location: Dallas Gem Mine (Gem Mine; Benitoite Mine), New Idria District, San Benito Co., California, USA. Scale: Crystal size 3.5 mm.
© John Veevaert

Jonesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4096:1:0.3354
Help on Cell Dimensions: Cell Dimensions: a = 10.618, b = 25.918, c = 8.6945, Z = 4; beta = 127.633° V = 1,894.87 Den(Calc)= 3.21
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 13(1), 3.03(0.45), 2.652(0.3),

Physical Properties of Jonesite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Colorless.
Help on Density: Density: 3.25
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=dull orange.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Jonesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.078 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2059,KPDmeas= 0.2034,KC= 0.2206
Ncalc = 1.71 - 1.72
Help on Optical Data: Optical Data: Biaxial (+), a=1.641, b=1.66, g=1.682, bire=0.0410
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Jonesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Jonesite =3.21 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEJonesite = 130.86 barns/electron
U=PEJonesite x relectron= 394.86 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 43.46 (Gamma Ray American Petroleum Institute Units)
Concentration of Jonesite per GRapi unit = 2.30 (%)

Estimated Radioactivity from Jonesite - barely detectable


Jonesite Classification

Help on  Dana Class: Dana Class: (61)Cyclosilicate Six-Membered Rings
  (61.02)with Al substituted rings
  (61.02.02)Dana Group Jonesite Ba2(K,Na)[Ti2(Si5Al)O18•n(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.DJ.30 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DJ -Inosilicates with 4-periodic double and triple chains
09.DJ.30 Jonesite Ba2(K,Na)[Ti2(Si5Al)O18•n(H2O) P 21/m 2/m

Other Jonesite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 89, p 314) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Jonesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.DJ.30





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