Benyacarite Mineral Data

Benyacarite Mineral Data
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General Benyacarite Information

Help on Chemical Formula: Chemical Formula: (H2O,K)2Ti(Mn++,Fe++)2(Fe+++,Ti)2Ti(PO4)4(O,F)2•14(H2O)
Help on Composition: Composition: Molecular Weight = 959.61 gm
   Potassium    1.22 %  K     1.47 % K2O
   Sodium       0.24 %  Na    0.32 % Na2O
   Magnesium    0.25 %  Mg    0.42 % MgO
   Titanium     7.98 %  Ti   13.32 % TiO2
   Manganese    8.59 %  Mn   11.09 % MnO
   Aluminum     0.28 %  Al    0.53 % Al2O3
   Iron        10.48 %  Fe    2.99 % FeO / 11.65 % Fe2O3
   Phosphorus  12.91 %  P    29.58 % P2O5
   Hydrogen     3.11 %  H    27.78 % H2O
   Oxygen      53.35 %  O
   Fluorine     1.58 %  F     1.58 % F
                 -   %   F    -0.67 % -O=F2    
              ______        ______ 
              100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (H2O)0.8K0.3Na0.1Mn2+1.5Fe2+0.4Mg0.1Fe3+1.4Ti0.6Al0.1Ti(PO4)4O1.2F0.8·14(H2O)
Help on Environment: Environment: Phosphate-bearing granitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: El Criollo mine, Cerro Balnco mining district in the Sierra Grande, near Tanti, Cordoba Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Maria Angelica R. de Benyacar (1928-), Comision Nacional de Energia Atomica, Buenos Ares, Argentina, for her contribution to mineralogical studies.
Help on Name Pronunciation: Name Pronunciation: Benyacarite + Pronunciation Say BENYACARITE
Help on Synonym: Synonym: ICSD 67962
  IMA1995-002
  PDF 44-1404
 

Benyacarite Image

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Benyacarite

Comments: Clear, transparent, pseudo-cubic benyacarite crystals on matrix.
Location: Folgosinho Quarry, Folgosinho, Gouveia, Guarda District, Portugal. Scale: Specimen Size 4 x 3 cm.
© Sergio Varvello / Mineral Service

Benyacarite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.513:1:0.608
Help on Cell Dimensions: Cell Dimensions: a = 10.561, b = 20.585, c = 12.516, Z = 4; V = 2,720.96 Den(Calc)= 2.34
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.13(1), 6.26(1), 10.29(0.9),
Help on Forms: Forms:

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Forms: ( 0 1 0) ( 1 1 1) ( 0 0 1)

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Demartin F , Pilati T , Gay H D , Gramaccioli C M , Zeitschrift fur Kristallographie , 208 (1993) p.57-71, The crystal structure of a mineral related to paulkerrite, Locality: granitic pegmatites in Cerro Blanco, Tanti, Cordoba, Argentina

 

Physical Properties of Benyacarite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellow, Colorless, Yellowish white, Greenish yellow.
Help on Density: Density: 2.4
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Benyacarite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2681,KPDmeas= 0.2614,KC= 0.2713
Ncalc = 1.63 - 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.612, b=1.621, g=1.649, bire=0.0370, 2V(Calc)=60, 2V(Meas)=60.
Help on Pleochroism (x): Pleochroism (x): None.
Help on Pleochroism (y): Pleochroism (y): None.
Help on Pleochroism (z): Pleochroism (z): None.
 

Calculated Properties of Benyacarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.35 gm/cc
note: Specific Gravity of Benyacarite =2.34 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBenyacarite = 7.27 barns/electron
U=PEBenyacarite x relectron= 17.08 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 17.69 (Gamma Ray American Petroleum Institute Units)
Concentration of Benyacarite per GRapi unit = 5.65 (%)

Estimated Radioactivity from Benyacarite - barely detectable

 

Benyacarite Classification
Help on Dana Class: Dana Class: 42.11.21.04 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq · x(H2O)
  (42.11.21)Paulkerrite Group
 
42.11.21.01 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m
 
42.11.21.02 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m
 
42.11.21.03 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na21 Ortho
 
42.11.21.04 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 08.DH.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
 
08.DH.35 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m
 
08.DH.35 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na21 Ortho
 
08.DH.35 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m
 
08.DH.35 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m
 

Other Benyacarite Information
Help on References: References: NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Benyacarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
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 Benyacarite Specimen Label here :

Benyacarite

(H2O,K)2Ti(Mn++,Fe++)2(Fe+++,Ti)2Ti(PO4)4(O,F)2•14(H2O)
Dana No: 42.11.21.04 Strunz No: 08.DH.35
Locality:

 

Notes: