Strontio-orthojoaquinite Mineral Data

Strontio-orthojoaquinite Mineral Data

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General Strontio-orthojoaquinite Information

Chemical Formula:

(Na,Fe++)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O)

Composition:

Molecular Weight = 1,284.18 gm

Barium 21.39 % Ba 23.88 % BaO

Sodium 1.79 % Na 2.41 % Na₂O

Strontium 13.65 % Sr 16.14 % SrO

Titanium 7.46 % Ti 12.44 % TiO₂

Iron 4.35 % Fe 5.59 % FeO

Silicon 17.50 % Si 37.43 % SiO₂

Hydrogen 0.24 % H 2.10 % H₂O

Oxygen 33.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaFe²⁺Ba₂Sr₂Ti₂(Si₄O₁₂)₂(OH)O·(H₂O)

IMA Status:

Approved IMA 1982

Locality:

Dallas Gem mine, 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

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Strontio-orthojoaquinite Crystallography

Axial Ratios:

a:b:c =1.0756:1:2.2902

Cell Dimensions:

a = 10.517, b = 9.777, c = 22.392, Z = 4; V = 2,302.45 Den(Calc)= 3.70

Crystal System:

OrthorhombicSpace Group: Pbcm or Pbc2

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

By Intensity(I/I_o): 2.801(1), 2.967(0.72), 3.001(0.48),

Physical Properties of Strontio-orthojoaquinite

Cleavage:

[001] Good

Color:

Green, Yellow green.

Density:

3.62

Diaphaniety:

Transparent

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Optical Properties of Strontio-orthojoaquinite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1989,KPDmeas= 0.2033,KC= 0.203

Optical Data:

Biaxial (+), a=1.71, b=1.718, g=1.78, bire=0.0700, 2V(Calc)=42, 2V(Meas)=35-45.

Calculated Properties of Strontio-orthojoaquinite

Electron Density:

r_electron=3.38 gm/cc
note: r_{Strontio-orthojoaquinite}=3.62 gm/cc.

Fermion Index

Fermion Index = 0.06656
Boson Index = 0.93344

Photoelectric:

PE_{Strontio-orthojoaquinite}= 110.54 barns/electron
U=PE_{Strontio-orthojoaquinite} x r_electron= 373.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontio-orthojoaquinite is Not Radioactive

Strontio-orthojoaquinite Classification

Dana Class:

60.1.1b.2 (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.08-60 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 Strontio-orthojoaquinite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Strontio-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 10 -École des Mines de Paris

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Strontio-orthojoaquinite

(Na,Fe++)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O)
Dana No: 60.1.1b.2 Strunz No: VIII/E.08-60
Locality:

Notes: