Bario-orthojoaquinite Mineral Data

Bario-orthojoaquinite Mineral Data

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General Bario-orthojoaquinite Information

Chemical Formula:

Fe++2(Ba,Sr)4Ti2[Si4O12]O2·(H2O)

Composition:

Molecular Weight = 1,316.03 gm

Barium 20.87 % Ba 23.30 % BaO

Strontium 13.32 % Sr 15.75 % SrO

Titanium 7.28 % Ti 12.14 % TiO₂

Iron 8.49 % Fe 10.92 % FeO

Silicon 17.07 % Si 36.52 % SiO₂

Hydrogen 0.15 % H 1.37 % H₂O

Oxygen 32.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₂Ba₂Sr₂Ti₂(Si₄O₁₂)₂O₂·(H₂O)

IMA Status:

Approved IMA 1980

Locality:

Benitoite Gem mine, head waters of the San Bent river, 1 mile south of Santa Rita Peak, San Benito Co. California. Link to MinDat.org Location Data.

Name Origin:

Named after its composition, orthorhombic crystal structure, and the relationship to joaquinite (named for Joaquin Ridge, Diablo Range, California, USA).

Synonym:

IMA2000-D

Bario-orthojoaquinite Image

Images:

Bario-orthojoaquinite

Comments: Several 0.75mm brownish red micro-crystals of bario-orthojoaquinite in matrix.
Location: Dallas Gem mine, San Benito Co., California, USA. Scale: Picture size 0.5 cm.
© Tom Loomis / Dakota Matrix

Bario-orthojoaquinite Crystallography

Axial Ratios:

a:b:c =1.0914:1:2.3533

Cell Dimensions:

a = 10.477, b = 9.599, c = 22.59, Z = 4; V = 2,271.85 Den(Calc)= 3.85

Crystal System:

OrthorhombicSpace Group: Ccmm or Ccm2

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

By Intensity(I/I_o): 2.997(1), 2.953(0.95), 2.824(0.9),

Physical Properties of Bario-orthojoaquinite

Cleavage:

[001] Good

Color:

Yellow, Yellowish brown.

Density:

3.96

Diaphaniety:

Transparent

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Optical Properties of Bario-orthojoaquinite

Gladstone-Dale:

CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KPDmeas= 0.1912,KC= 0.2015

Optical Data:

Biaxial (+), a=1.735, b=1.737, g=1.8, bire=0.0650, 2V(Calc)=22, 2V(Meas)=10-15.

Pleochroism (x):

yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

very pale yellow.

Calculated Properties of Bario-orthojoaquinite

Electron Density:

r_electron=3.59 gm/cc
note: r_{Bario-orthojoaquinite}=3.85 gm/cc.

Fermion Index

Fermion Index = 0.06585
Boson Index = 0.93415

Photoelectric:

PE_{Bario-orthojoaquinite}= 109.31 barns/electron
U=PE_{Bario-orthojoaquinite} x r_electron= 392.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bario-orthojoaquinite is Not Radioactive

Bario-orthojoaquinite Classification

Dana Class:

60.1.1b.3 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.1b)Joaquinite group (Ortho-joaquinite subgroup)

60.1.1b.1 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho

60.1.1b.2 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho

60.1.1b.3 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho

60.1.1b.4 Byelorussite-(Ce) NaBa2(Ce,La)2MnTi2Si8O26(F,OH)·(H2O) P 2₁2₁2₁ 2 2 2

60.1.1b.5 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m

Strunz Class:

VIII/E.08-70 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series

VIII/E.08-05 Verplanckite Ba2(Mn,Ti,Fe)2Si2O6(O,OH,Cl,F)2·3(H2O) P 6/mmm 6/m 2/m 2/m

VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 4₁/a 4/m

VIII/E.08-15 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2

VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho

VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho

VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2

VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m

VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho

Other Bario-orthojoaquinite Information

References:

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

See Also:

Links to other databases for Bario-orthojoaquinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Bario-orthojoaquinite

Fe++2(Ba,Sr)4Ti2[Si4O12]O2·(H2O)
Dana No: 60.1.1b.3 Strunz No: VIII/E.08-70
Locality:

Notes: