Zanazziite
A valid IMA mineral species
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About Zanazziite
Formula:
Ca2Mg5Be4(PO4)6(OH)4 · 6H2O
The formula given above is the idealised formula. The type description and Mandarino (1997) writes the formula as Ca2(Mg,Fe3+)(Mg,Fe2+, Al)Be4Mg5(PO4)6(OH)4.6H2O
Colour:
Pale to dark olive-green
Lustre:
Vitreous, Pearly
Hardness:
5
Specific Gravity:
2.76
Crystal System:
Monoclinic
Member of:
Name:
Named by Peter B. Leavens, John S. White, and John A. Nelen in 1990 in honour of Pier Francesco Zanazzi (30 April 1939, Gorizia, Friuli-Venezia Giulia, Italy), crystallographer and Professor of Mineralogy at the University of Perugia (Italy).
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
4385
Long-form identifier:
mindat:1:1:4385:0
IMA Classification of Zanazziite
Approved
IMA Formula:
Ca2Mg5Be4(PO4)6(OH)4·6H2O
Approval year:
1986
First published:
1990
Classification of Zanazziite
8.DA.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
42.7.7.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
19.12.64
19 : Phosphates
12 : Phosphates of Mn
19 : Phosphates
12 : Phosphates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Zan | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Zanazziite
Vitreous, Pearly
Transparency:
Translucent
Comment:
Pearly on cleavages
Colour:
Pale to dark olive-green
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {100}
Distinct on {010}
Good on {100}
Distinct on {010}
Density:
2.76 g/cm3 (Measured) 2.77 g/cm3 (Calculated)
Optical Data of Zanazziite
Type:
Biaxial (+)
RI values:
nα = 1.606(2) nβ = 1.61 nγ = 1.62
2V:
Measured: 72° , Calculated: 66°
Max. Birefringence:
δ = 0.014
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v
Chemistry of Zanazziite
Mindat Formula:
Ca2Mg5Be4(PO4)6(OH)4 · 6H2O
The formula given above is the idealised formula. The type description and Mandarino (1997) writes the formula as Ca2(Mg,Fe3+)(Mg,Fe2+, Al)Be4Mg5(PO4)6(OH)4.6H2O
The formula given above is the idealised formula. The type description and Mandarino (1997) writes the formula as Ca2(Mg,Fe3+)(Mg,Fe2+, Al)Be4Mg5(PO4)6(OH)4.6H2O
Element Weights:
Common Impurities:
Mn,Si
Crystallography of Zanazziite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 15.874(4) Å, b = 11.854(3) Å, c = 6.605(1) Å
β = 95.35°
β = 95.35°
Ratio:
a:b:c = 1.339 : 1 : 0.557
Unit Cell V:
1237 ų
Z:
2
Morphology:
Barrel-shaped pseudohexagonal crystals. Forms observed: {100}, {11O}and {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
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Rotation
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Labels
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012416 | Zanazziite | Rastsvetaeva R K, Rozenberg K A, Chukanov N V, Mockel S (2009) The crystal structure of an iron-rich variety of zanazziite belonging to heteropolyhedral framework roscherite-group beryllophosphates Crystallography Reports 54 568-571 | 2009 | Sapucaia mine, Minas Gerais, Brazil | 0 | 293 | |
| 0015658 | Zanazziite | Fanfani L, Nunzi A, Zananni P F, Zanzari A R (1975) The crystal structure of roscherite Tschermaks Mineralogische und Petrographische Mitteilungen 22 266-277 | 1975 | Lavra da Ilha, Taquaral, Minas Gerais, Brazil | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.50 Å | (90) |
| 5.91 Å | (100) |
| 3.16 Å | (70) |
| 3.05 Å | (50) |
| 2.766 Å | (50) |
| 2.682 Å | (40b) |
| 2.208 Å | (40) |
| 1.642 Å | (50b) |
Comments:
From type description
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Geological Setting:
Granitic pegmatites
Type Occurrence of Zanazziite
General Appearance of Type Material:
As barrel-shaped crystals and crystal rosettes up to 4 mm.
Place of Conservation of Type Material:
The holotype specimen, #R17847, is preserved at the Smithsonian Institution.
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:
Synonyms of Zanazziite
Other Language Names for Zanazziite
Relationship of Zanazziite to other Species
Member of:
Other Members of Roscherite Group:
| Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : P1 |
| Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : P1 |
| Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
| Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
| Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O | Mon. 2/m : B2/b |
| Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : B2/m |
| Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : B2/b |
Common Associates
Associations Based on Photo Data:
| 121 photos of Zanazziite associated with Eosphorite | Mn2+Al(PO4)(OH)2 · H2O |
| 73 photos of Zanazziite associated with Albite | Na(AlSi3O8) |
| 67 photos of Zanazziite associated with Quartz | SiO2 |
| 65 photos of Zanazziite associated with 'Rose Quartz' | SiO2 |
| 51 photos of Zanazziite associated with Kosnarite | KZr2(PO4)3 |
| 28 photos of Zanazziite associated with Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O |
| 25 photos of Zanazziite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 25 photos of Zanazziite associated with Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| 19 photos of Zanazziite associated with Topaz | Al2(SiO4)(F,OH)2 |
| 18 photos of Zanazziite associated with Hydroxylherderite | CaBe(PO4)(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.DA.05 | Bearsite | Be2(AsO4)(OH) · 4H2O |
| 8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O |
| 8.DA.10 | Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O |
| 8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O |
| 8.DA.10 | Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O |
| 8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O |
| 8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O |
| 8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O |
| 8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O |
| 8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Zanazziite
mindat.org URL:
https://www.mindat.org/min-4385.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Zanazziite
Reference List:
Leavens, Peter B., White, John Sampson, Nelen, Joseph A. (1990) Zanazziite, a new mineral from Minas Gerais, Brazil. The Mineralogical Record, 21 (5) Tucson. 413-417
Rastsvetaeva, R. K., Rozenberg, K. A., Chukanov, N. V., Möckel, S. (2009) The crystal structure of an iron-rich variety of zanazziite belonging to heteropolyhedral framework roscherite-group beryllophosphates. Crystallography Reports, 54 (4) 568-571 doi:10.1134/s1063774509040051
Frost, Ray L., Xi, Yunfei, Scholz, Ricardo, Belotti, Fernanda M., Dias Menezes Filho, Luiz Alberto (2013) A vibrational spectroscopic study of the phosphate mineral zanazziite – Ca2(MgFe2+)(MgFe2+Al)4Be4(PO4)6⋅6(H2O) Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 104. 250-256 doi:10.1016/j.saa.2012.11.017
Localities for Zanazziite
Showing 24 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| Walter (1998) +1 other reference |
| Pichler (2009) |
Brazil | |
| Menezes Filho et al. (2019) |
| Leon Hupperichs photo | |
| Sergio Varvello specimen & Photo +1 other reference | |
| Sergio Varvello collection |
| |
| Simone Citon specimen | |
| Cahves et al. (2016) | |
| Menezes Filho et al. (2012) | |
| www.shannonsminerals.com (n.d.) | |
| Sergio Varvello collection | |
| Atencio et al. (2005) |
| Leavens et al. (1990) |
| Luiz Alberto Dias Menezes Filho et al. (2016) | |
| Chukanov et al. (2007) |
| Luis Menezes +1 other reference | |
| Menezes (n.d.) | |
| Confirmed | |
| Paulo Matioli |
| Atencio et al. (2005) | |
USA | |
| King et al. (1994) +1 other reference |
| King et al. (1994) +1 other reference | |
| Whitmore et al. (2004) +2 other references |
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Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil