Zaccagnaite Mineral Data

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General Zaccagnaite Information

Chemical Formula:

Zn4Al2(OH)12(CO3)•3(H2O)

Composition:

Molecular Weight = 629.83 gm

Aluminum 9.00 % Al 17.00 % Al₂O₃

Zinc 40.49 % Zn 50.40 % ZnO

Hydrogen 2.88 % H 25.74 % H₂O

Carbon 1.91 % C 6.99 % CO₂

Oxygen 45.73 % O

______ ______

100.00 % 100.13 % = TOTAL OXIDE

Empirical Formula:

Zn_3.9Al_2.1(OH)₁₂(CO₃)•3(H₂O)

Environment:

Hydrothermal alteration product of sphalerite and Al-rich fluids in calcite vein cavities within the Carrara marble. A member of the hydrotalcite-manasseite groups.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Gioia quarry, Colonnata valley, Carrara basin region, Apuan Alps, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Domenico Zaccagna (1851-1940) who published the first geologic map of the Apuan Alps and a collector of minerals from the Carrara Marble.

Synonym:

IMA1997-019

Zaccagnaite Image

Images:

Zaccagnaite Zincowoodwardite

Comments: White to pale bluish zaccagnaite intimately intergrown with zincowoodwardite.
Location: Hilarion Mine, Agios Konstantinos, Lavrion District, Attikí Prefecture, Greece. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Zaccagnaite Fraipontite

Comments: Scanning electron microscope image of hexagonal, tapering, prismatic zaccagnaite crystals, covered by a thin crust of fraipontite. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Zaccagnaite Crystallography

Axial Ratios:

a:c = 1:4.91895

Cell Dimensions:

a = 3.0725, c = 15.1135, Z = 0.3333; V = 123.56 Den(Calc)= 2.82

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 7.51(1)(002), 1.542(0.75)(108), 1.539(0.75)(110),3.794(0.5)(004), 1.83(0.4)(106), 2.175(0.4)(104), 2.511(0.4)(102), 1.89(0.25)(008), 2.65(0.25)(100),

Crystal Structure:

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Merlino S , Orlandi P , American Mineralogist , 86 (2001) p.1293-1301, Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries:, their chemical compositions, physical properties and structural features

Physical Properties of Zaccagnaite

Color:

White, Colorless.

Diaphaneity:

Transparent

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

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

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Zaccagnaite

Optical Data:

Uniaxial (?).

NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2171) where Ncalc=Dcalc*KC+1

Calculated Properties of Zaccagnaite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Zaccagnaite =2.82 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Zaccagnaite= 19.89 barns/electron
U=PE_Zaccagnaite x rElectron Density= 55.64 barns/cc.

Radioactivity:

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

Zaccagnaite Classification

Dana Class:

16b.06.01.04 (16b)Carbonates - Hydroxyl or Halogen

(16b.06)Dana Type

(16b.06.01)Sjorgrenite-Hydrotalcite Group (Sojogrenite Subgroup:Hexagonal)

16b.06.01.01 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.02 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.03 Sjogrenite Mg6Fe2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.04 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

05.DA.45 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.45 Brugnatellite Mg6Fe(CO3)(OH)13•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)•2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

05.DA.45 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Sjogrenite Mg6Fe2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Zaccagnaite Information

References:

NAME( AmMin, Vol 86, p 1293-1301) PHYS. PROP.(AmMin, Vol 86, p 1293-1301) OPTIC PROP.(AmMin, Vol 86, p 1293-1301)

See Also:

Links to other databases for Zaccagnaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Zaccagnaite

Zn4Al2(OH)12(CO3)•3(H2O)
Dana No: 16b.06.01.04 Strunz No: 05.DA.45
Locality:

Notes: