Benyacarite Mineral Data (original) (raw)

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

Click Here for Larger Benyacarite Image in a New Browser Window Images:

Click Here for Larger Benyacarite Image 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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | --------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Benyacarite Structure Window Crystal Structure:

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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: