Zanazziite Mineral Data

General Zanazziite Information

Chemical Formula:

Ca2(Mg,Fe++)(Mg,Fe++,Al,Mn,Fe+++)4Be4(PO4)6(OH)4•6(H2O)

Composition:

Molecular Weight = 1,044.11 gm

Calcium 7.68 % Ca 10.74 % CaO

Magnesium 6.98 % Mg 11.58 % MgO

Manganese 1.05 % Mn 1.36 % MnO

Beryllium 3.45 % Be 9.58 % BeO

Aluminum 0.78 % Al 1.46 % Al₂O₃

Iron 8.56 % Fe 10.32 % FeO / 0.76 % Fe₂O₃

Phosphorus 17.80 % P 40.78 % P₂O₅

Hydrogen 1.60 % H 14.32 % H₂O

Oxygen 52.10 % O

______ ______

100.00 % 100.92 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mg_0.6Fe²⁺_0.4Mg_2.4Fe²⁺_1.1Al_0.3Mn²⁺_0.2Fe³⁺_0.1Be₄(PO₄)₆(OH)_3.4�6.6(H₂O)

Environment:

Pegmatitic environment. Resembles roscherite.

IMA Status:

Approved IMA 1990

Locality:

Lavra da Ilha pegmatite, near Taquaral, in northeastern Minas Gerais, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named after Dr. Pier F. Zanazzi (1939-) of the Universita degli Studi di Perugia, in recognition of his studies of the crystal structures and crystal chemistry of minerals.

Name Pronunciation:

Zanazziite + Pronunciation

Synonym:

ICSD 4257

IMA1986-054

PDF 46-1346

Zanazziite Image

Images:

Eosphorite Zanazziite

Comments: Minor crystals of equant, olive green zanazziite and brown, lath-like crystals of eosphorite on quartz.
Location: Taquaral, Minas Gerais, Brazil. Scale: Picture size 1 cm.
© John Veevaert

Images:

Zanazziite

Comments: Olive-green prismatic translucent zanazziite microcrystals on quartz.
Location: Taquarel, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Kosnarite Zanazziite

Comments: Beige crystals of kosnarite with pinkish, radial aggregates of zanazziite on whte albite matrix.
Location: Jenipapo, Itinga, Minas Gerais, Brazil. Scale: Picture size 6 cm.
© Fabre Minerals

Zanazziite Crystallography

Axial Ratios:

a:b:c =1.3391:1:0.5571

Cell Dimensions:

a = 15.874, b = 11.854, c = 6.605, Z = 2; beta = 95.35° V = 1,237.45 Den(Calc)= 2.80

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 5.91(1), 9.5(0.9), 3.16(0.7),

Physical Properties of Zanazziite

Cleavage:

{100} Good, {010} Distinct

Color:

Pale olive green, Dark olive green.

Density:

2.76

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Columnar - Forms columns

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Zanazziite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2186,KPDmeas= 0.2217,KC= 0.2195
Ncalc = 1.61

Optical Data:

Biaxial (+), a=1.606, b=1.61, g=1.62, bire=0.0140, 2V(Calc)=66, 2V(Meas)=72.

Calculated Properties of Zanazziite

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Zanazziite =2.80 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Zanazziite= 4.79 barns/electron
U=PE_Zanazziite x rElectron Density= 13.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zanazziite is Not Radioactive

Zanazziite Classification

Dana Class:

42.07.07.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.07)Roscherite group

42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

42.07.07.03 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

42.07.07.08 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Strunz Class:

08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DA -With small (and occasionally larger) cations

08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Other Zanazziite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.76,p1732,1991) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Zanazziite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Zanazziite

Ca2(Mg,Fe++)(Mg,Fe++,Al,Mn,Fe+++)4Be4(PO4)6(OH)4•6(H2O)
Dana No: 42.07.07.03 Strunz No: 08.DA.10
Locality:

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