Strontio-orthojoaquinite Mineral Data

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

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:

Orthorhombic Space 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

Diaphaneity:

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
Ncalc = 1.73 - 1.75

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:

Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Strontio-orthojoaquinite =3.62 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strontio-orthojoaquinite is Not Radioactive

Strontio-orthojoaquinite Classification

Dana Class:

60.01.01b.02 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.01b)Joaquinite group (Ortho-joaquinite subgroup)

60.01.01b.01 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)•(H2O) Ccmm or Ccm21 Ortho

60.01.01b.02 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2•(H2O) Pbcm or Pbc2 Ortho

60.01.01b.03 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2•(H2O) Ccmm or Ccm2 Ortho

60.01.01b.04 Byelorussite-(Ce) NaBa2(Ce,La)2MnTi2Si8O26(F,OH)•(H2O) P 2₁2₁2₁ 2 2 2

60.01.01b.05 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)•H2O Ccmm 2/m 2/m 2/m

Strunz Class:

09.CE.25 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.25 Byelorussite-(Ce) NaBa2(Ce,La)2MnTi2Si8O26(F,OH)•(H2O) P 2₁2₁2₁ 2 2 2

09.CE.25 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2•(H2O) Ccmm or Ccm2 Ortho

09.CE.25 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)•(H2O) C 2 2

09.CE.25 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)•(H2O) Ccmm or Ccm21 Ortho

09.CE.25 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2•(H2O) Pbcm or Pbc2 Ortho

09.CE.25 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2•(H2O) C 2 2

09.CE.25 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)•H2O Ccmm 2/m 2/m 2/m

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 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Strontio-orthojoaquinite

(Na,Fe++)2Ba2Sr2Ti2[Si4O12]2(O,OH)2•(H2O)
Dana No: 60.01.01b.02 Strunz No: 09.CE.25
Locality:

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