Joaquinite-(Ce) Mineral Data

General Joaquinite-(Ce) Information

Chemical Formula:

NaFe++Ba2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)•(H2O)

Composition:

Molecular Weight = 1,419.19 gm

Barium 19.35 % Ba 21.61 % BaO

Sodium 1.62 % Na 2.18 % Na₂O

Cerium 19.75 % Ce 23.13 % Ce₂O₃

Titanium 3.37 % Ti 5.63 % TiO₂

Niobium 6.55 % Nb 9.36 % Nb₂O₅

Iron 3.94 % Fe 5.06 % FeO

Silicon 15.83 % Si 33.87 % SiO₂

Hydrogen 0.18 % H 1.59 % H₂O

Oxygen 28.75 % O

Fluorine 0.67 % F 0.67 % F

- % F -0.28 % -O=F₂

______ ______

100.00 % 102.82 % = TOTAL OXIDE

Empirical Formula:

NaFe²⁺Ba₂Ce₂TiNb(Si₄O₁₂)₂(OH)_0.5F_0.5•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Benitoite Gem mine, head waters of the San Benito River, Joaquin Ridge, Diablo Range, 1 mile south of Santa Rita Peak, San Benito Co. California. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Joaquinite-(Ce) + Pronunciation

Synonym:

ICSD 4359

IMA2000-D

PDF 36-385

Joaquinite-(Ce) Image

Images:

Joaquinite-(Ce)

Comments: Brown crystal of joaquinite-(Ce).
Location: Benitoite Gem mine, San Benito County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Joaquinite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.0856:1:1.2216

Cell Dimensions:

a = 10.516, b = 9.686, c = 11.833, Z = 2; beta = 109.67° V = 1,134.95 Den(Calc)= 4.15

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 2.8(1), 5.58(0.7), 2.95(0.18),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Dowty E , American Mineralogist , 60 (1975) p.872-878, Crystal structure of joaquinite

Physical Properties of Joaquinite-(Ce)

Cleavage:

{???} Good

Color:

Brown, Honey yellow, Orange.

Density:

3.62 - 3.98, Average = 3.8

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Optical Properties of Joaquinite-(Ce)

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1853,KPDmeas= 0.2024,KC= 0.198
Ncalc = 1.72 - 1.82

Optical Data:

Biaxial (+), a=1.748-1.754, b=1.76-1.767, g=1.762-1.823, bire=0.0140-0.0690

Pleochroism (x):

light yellow.

Pleochroism (y):

light yellow.

Pleochroism (z):

colorless.

Calculated Properties of Joaquinite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Joaquinite-(Ce) =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Joaquinite-(Ce)}= 196.52 barns/electron
U=PE_{Joaquinite-(Ce)} x r_electron= 685.10 barns/cc.

Radioactivity:

GRapi = 19,322.82 (Gamma Ray American Petroleum Institute Units)
Concentration of Joaquinite-(Ce) per GRapi unit = 51.75 (PPM)

Joaquinite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Joaquinite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.95 cm	442,304	1.20E-05	19,322.82	6.35
100 gm / 3.69 cm	44,230	1.20E-06	1,932.28	0.64
10 gm / 1.71 cm	4,423	1.20E-07	193.23	0.06
1 gm / 7.95 mm	442	1.20E-08	19.32	0.01
0.1 gm / 3.69 mm	44	1.20E-09	1.93	0.00
0.01 gm / 1.71 mm	4	1.20E-10	0.19	0.00
0.001 gm / 0.80 mm	0	1.20E-11	0.02	0.00

Weight of pure Joaquinite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.80 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.99 % Th) From Sum REE Elements (19.75 % REE)

Joaquinite-(Ce) Classification

Dana Class:

60.01.01a.01 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.01a)Joaquinite group (Clino-joaquinite subgroup)

60.01.01a.01 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)•(H2O) C 2 2

60.01.01a.02 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2•(H2O) C 2 2

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 Joaquinite-(Ce) 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 Joaquinite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Joaquinite-(Ce) Specimen Label here :

Joaquinite-(Ce)

NaFe++Ba2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)•(H2O)
Dana No: 60.01.01a.01 Strunz No: 09.CE.25
Locality:

Notes: