Menezesite Mineral Data

Menezesite Mineral Data
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General Menezesite Information

Help on Chemical Formula: Chemical Formula: Ba2MgZr4(BaNb12O42)•12H2O
Help on Composition: Composition: Molecular Weight = 2,778.48 gm
   Potassium   0.75 %  K     0.90 % K2O
   Barium     10.82 %  Ba   12.09 % BaO
   Sodium      0.05 %  Na    0.07 % Na2O
   Calcium     0.45 %  Ca    0.63 % CaO
   Lanthanum   0.10 %  La    0.12 % La2O3
   Cerium      0.86 %  Ce    1.00 % Ce2O3
   Thorium     4.59 %  Th    5.23 % ThO2
   Magnesium   0.82 %  Mg    1.36 % MgO
   Zirconium   9.03 %  Zr   12.20 % ZrO2
   Uranium     0.17 %  U     0.19 % UO2
   Tantalum    2.34 %  Ta    2.86 % Ta2O5
   Titanium    5.60 %  Ti    9.34 % TiO2
   Manganese   0.45 %  Mn    0.59 % MnO
   Niobium    30.86 %  Nb   44.15 % Nb2O5
   Aluminum    0.03 %  Al    0.06 % Al2O3
   Iron        0.46 %  Fe    0.59 % FeO
   Silicon     0.12 %  Si    0.26 % SiO2
   Hydrogen    0.87 %  H     7.78 % H2O
   Neodymium   0.52 %  Nd    0.61 % Nd2O3
   Oxygen     31.09 %  O
             ______        ______ 
             100.00 %      100.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba1.47K0.53Ca0.31Ce0.17Nd0.1Na0.06La0.02Mg0.94Mn2+0.23Fe2+0.23Al0.03Zr2.75Ti0.96 Th0.29Ba0.72Th0.26U0.02Nb9.23Ti2.29·12(H2O)
Help on Environment: Environment: Occurs in the contact zone between dolomite carbonatite and "jacupirangite" (=a pyroxenite). First natural heteropolyniobate.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Jacupiranga mine, Cajati County, São Paulo, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Luiz Alberto Dias Menezes Filho (born 1950), mining engineer, mineral collector, and merchant
Help on Synonym: Synonym: IMA2005-023
 

Menezesite Image

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Menezesite

Comments: Orange rhombododecahedral crystals of menezesite to 0.75mm on matrix.
Location: Jacupiranga mine, Cajati county, Sao Paulo, Brazil. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix
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Menezesite

Comments: Brownish-red rhombododecahedral crystals of menezesite over calcite (with tiny black tochilinite inclusions). AmMin v93:82.
Location: Jacupiranga mine, in Cajati county, São Paulo state, Brazil. Scale: Crystal size 0.5 mm.
© American Mineralogist

Menezesite Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 13.017, Z = 2; V = 2,205.63 Den(Calc)= 4.18
Help on Crystal System: Crystal System: Isometric - DiploidalH-M Symbol (2/m 3) Space Group: Im3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.183(1), 1.0741(0.21), 3.256(0.16),2.655(0.13), 3.07(0.13), 4.592(0.12), 2.923(0.11), 4.136(0.11),
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Atencio D , Coutinho J M V , Doriguetto A C , Mascarenhas Y P , Ellena J , Ferrari V C , American Mineralogist , 93 (2008) p.81-87, Menezesite, the first natural heteropolyniobate, from Cajati, Sao Paulo, Brazil:, description and crystal structure, Locality: Jacupiranga mine, Cajati county, Sao Paulo, Brazil

 

Physical Properties of Menezesite

Help on Cleavage: Cleavage: None
Help on Color: Color: Reddish borwn.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Menezesite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2344,KC= 0.2473
Ncalc = 2.03
Help on Optical Data: Optical Data: Isotropic, n=1.93-2.03.
 

Calculated Properties of Menezesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.84 gm/cc
note: Specific Gravity of Menezesite =4.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMenezesite = 252.41 barns/electron
U=PEMenezesite x relectron= 968.46 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 103,359.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Menezesite per GRapi unit = 9.67 (PPM)

Menezesite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 294.28 ± 73.57 grams of pure Menezesite .

Estimated Radioactivity from Menezesite - strong
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 / 7.70 cm 2,364,668 6.39E-05 103,359.74 33.98
100 gm / 3.57 cm 236,467 6.39E-06 10,335.97 3.40
10 gm / 1.66 cm 23,647 6.39E-07 1,033.60 0.34
1 gm / 7.70 mm 2,365 6.39E-08 103.36 0.03
0.1 gm / 3.57 mm 236 6.39E-09 10.34 0.00
0.01 gm / 1.66 mm 24 6.39E-10 1.03 0.00
0.001 gm / 0.77 mm 2 6.39E-11 0.10 0.00

Weight of pure Menezesite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.18 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
 

Menezesite Classification
Help on Dana Class: Dana Class: 49.02.05.01 (49)Basic and Hydrated Molybdates and Tungstates
  (49.02)(Hydrated)
  (49.02.05)Dana Group
 
49.02.05.01 Menezesite! Ba2MgZr4(BaNb12O42)•12H2O Im3 2/m 3
Help on Strunz Class: Strunz Class: 04.FN.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FN -
 
04.FN.05 Menezesite! Ba2MgZr4(BaNb12O42)•12H2O Im3 2/m 3
 

Other Menezesite Information
Help on References: References: NAME( AmMin, v93:81) PHYS. PROP.(AmMin, v93:81) OPTIC PROP.(AmMin, v93:81)
Help on See Also: See Also: Links to other databases for Menezesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Menezesite here :
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Menezesite Specimen Label here :

Menezesite

Ba2MgZr4(BaNb12O42)•12H2O
Dana No: 49.02.05.01 Strunz No: 04.FN.05
Locality:

 

Notes: