Peretaite
A valid IMA mineral species
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About Peretaite
Formula:
Ca(SbO)4(SO4)2(OH)2 · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
4.06 (Calculated)
Crystal System:
Monoclinic
Name:
From the type locality.
Type Locality:
This page provides mineralogical data about Peretaite.
Unique Identifiers
Mindat ID:
3159
Long-form identifier:
mindat:1:1:3159:8
Similar Names
| Paratooite-(La) | A valid IMA mineral species | (La,Sr,Ca)4CuCa(Na,Ca)2(CO3)8 |
| Perettiite-(Y) | A valid IMA mineral species | Y2Mn4FeSi2B8O24 |
| Piretite | A valid IMA mineral species | Ca(UO2)3(SeO3)2(OH)4 · 4H2O |
| Portite | A synonym of Natrolite |
IMA Classification of Peretaite
Approved
IMA Formula:
CaSb3+4O4(S6+O4)2(OH)2(H2O)2
Approval year:
1979
First published:
1980
Classification of Peretaite
7.DF.45
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
31.6.4.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
6 : (AB)5(XO4)2Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
6 : (AB)5(XO4)2Zq·xH2O
25.8.3
25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
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 |
|---|---|---|
| Pta | 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 Peretaite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Comment:
Can be pink due to encrustations of valentinite.
Streak:
White
Hardness:
3½ - 4 on Mohs scale
Hardness:
VHN15=170 - 190 kg/mm2 - Vickers
Cleavage:
Perfect
Perfect on {100}.
Perfect on {100}.
Density:
4.06 g/cm3 (Calculated)
Comment:
Measured > 3.8
Optical Data of Peretaite
Type:
Biaxial (+)
RI values:
nα = 1.841(1) nγ = 1.935(1)
Max. Birefringence:
δ = 0.094
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:
Very 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.
No measured or calculated 2V is on file for this mineral, so the value used here (92°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (92°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
relatively strong
Optical Extinction:
Z = c; X ∧ b = ∼28°.
Comments:
Beta not determined. 2V is very large.
Chemistry of Peretaite
Mindat Formula:
Ca(SbO)4(SO4)2(OH)2 · 2H2O
Element Weights:
Crystallography of Peretaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 24.665(4) Å, b = 5.6006(9) Å, c = 10.185(1) Å
β = 95.98(1)°
β = 95.98(1)°
Ratio:
a:b:c = 4.404 : 1 : 1.819
Unit Cell V:
1,399.29 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Divergent sprays of laths, botyroidal, massive. Crystals are flattened on {100} and often elongated along [001]. Forms include {100}, {310}, {110}, {122}, {001}, {010}, {210}, {201}, {302}, and {601}.
Twinning:
Very common on {100}.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
|---|---|---|---|---|---|---|---|
| 0000796 | Peretaite | Menchetti S, Sabelli C (1980) Peretaite, CaSb4O4(OH)2(SO4)2*2H2O: Its atomic arrangement and twinning American Mineralogist 65 940-946 |  | 1980 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.19 Å | (100) |
| 3.06 Å | (67) |
| 2.451 Å | (31) |
| 3.10 Å | (24) |
| 6.12 Å | (21) |
| 2.532 Å | (20) |
| 2.068 Å | (17) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Geological Setting:
Formed by the action of sulfuric acid on oxidizing stibnite deposits.
Type Occurrence of Peretaite
General Appearance of Type Material:
Aggregates of tabular crystals. The largest crystals have dimensions up to 5 x 2 x 0.5 mm.
Place of Conservation of Type Material:
University of Florence, Florence, Italy, number 164/I.
Pisa University, Pisa, Italy.
National Museum of Natural History, Washington, D.C., USA, numbers 148481, 148482.
Pisa University, Pisa, Italy.
National Museum of Natural History, Washington, D.C., USA, numbers 148481, 148482.
Geological Setting of Type Material:
Stibnite deposit in deeply silicified limestone. Formed by the action of sulfuric acid on stibnite in the presence of limestone.
Associated Minerals at Type Locality:
Synonyms of Peretaite
Other Language Names for Peretaite
Common Associates
Associations Based on Photo Data:
| 23 photos of Peretaite associated with Klebelsbergite | Sb4O4(SO4)(OH)2 |
| 15 photos of Peretaite associated with Stibnite | Sb2S3 |
| 6 photos of Peretaite associated with Metastibnite | Sb2S3 |
| 5 photos of Peretaite associated with Quartz | SiO2 |
| 4 photos of Peretaite associated with Native Sulphur | S8 |
| 3 photos of Peretaite associated with Kermesite | Sb2S2O |
| 3 photos of Peretaite associated with Greigite | Fe2+Fe3+2S4 |
| 1 photo of Peretaite associated with Tripuhyite | Fe3+Sb5+O4 |
| 1 photo of Peretaite associated with Valentinite | Sb2O3 |
Related Minerals - Strunz-mindat Grouping
| 7.DF. | Siligiite | [Pb(H2O)5(SO4)][Zn9(OH)18] |
| 7.DF. | Alcaparrosaite | K3Ti4+Fe3+(SO4)4O(H2O)2 |
| 7.DF. | Flaggite | Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O) |
| 7.DF. | Bairdite | Pb2Cu2+4Te6+2O10(OH)2(SO4) · H2O |
| 7.DF. | Tzeferisite | CaZn8(SO4)2(OH)12Cl2(H2O)9 |
| 7.DF. | Cherokeeite | [Pb2Zn(OH)4](SO4) · H2O |
| 7.DF. | Ammoniomathesiusite | (NH4)5(UO2)4(SO4)4(VO5) · 4H2O |
| 7.DF. | Sigogglinite | [Pb6Zn(OH)8]2(SO4)6 · (H2O)8-x |
| 7.DF.X | Blueridgeite | [Pb8Zn3Cu2+(OH)16](SO4)2(S2O3)2 · 2H2O |
| 7.DF. | Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O |
| 7.DF. | Poellmannite | Ca6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DF. | Carlsonite | (NH4)5Fe3+3O(SO4)6 · 7H2O |
| 7.DF. | Cuprocherokeeite | [Pb8Zn3Cu2+(OH)16](SO4)4 · 4H2O |
| 7.DF. | Haywoodite | [Pb(H2O)10][Zn12(OH)20(H2O)(SO4)3] |
| 7.DF. | Chromschieffelinite | Pb10Te6+6O20(OH)14(CrO4)(H2O)5 |
| 7.DF.05 | Uklonskovite | NaMg(SO4)F · 2H2O |
| 7.DF.10 | Kainite | KMg(SO4)Cl · 3H2O |
| 7.DF.10 | Kaliochalcite | KCu2(SO4)2[(OH)(H2O)] |
| 7.DF.15 | Natrochalcite | NaCu2(SO4)2(OH) · 2H2O |
| 7.DF.17 | Genplesite | Ca3Sn(SO4)2(OH)6 · 3H2O |
| 7.DF.17 | 'Unnamed (Ba-Sb Silicate-Sulphate-Hydroxide-Hydrate)' | Ba3Sb5+[(Si,S)O3(OH)]2(OH,O)6 · 3H2O |
| 7.DF.20 | Sideronatrite | Na2Fe(SO4)2(OH) · 3H2O |
| 7.DF.20 | Metasideronatrite | Na2Fe(SO4)2(OH) · H2O |
| 7.DF.25 | Fleischerite | Pb3Ge(SO4)2(OH)6 · 3H2O |
| 7.DF.25 | Mallestigite | Pb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O |
| 7.DF.25 | Schaurteite | Ca3Ge(SO4)2(OH)6 · 4H2O |
| 7.DF.25 | Despujolsite | Ca3Mn4+(SO4)2(OH)6 · 3H2O |
| 7.DF.30 | Slavíkite | (H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O |
| 7.DF.35 | Metavoltine | K2Na6Fe2+Fe3+6O2(SO4)12 · 18H2O |
| 7.DF.40 | Lannonite | Mg2Ca4Al4(SO4)8F8 · 24H2O |
| 7.DF.40 | Vlodavetsite | AlCa2(SO4)2F2Cl · 4H2O |
| 7.DF.50 | Gordaite | NaZn4(SO4)(OH)6Cl · 6H2O |
| 7.DF.50 | Calamaite | Na2TiO(SO4)2 · 2H2O |
| 7.DF.52 | Huizingite-(Al) | [(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6] |
| 7.DF.52 | Scordariite | K8(Fe3+0.67◻0.33)[Fe3+3O(SO4)6]2 · 14H2O |
| 7.DF.55 | Clairite | (NH4)2Fe3(SO4)4(OH)3 · 3H2O |
| 7.DF.55 | Giacovazzoite | K5Fe3+3O(SO4)6 · 10H2O |
| 7.DF.57 | Magnanelliite | K3Fe3+2(SO4)4(OH)(H2O)2 |
| 7.DF.60 | Arzrunite | Cu4Pb2(SO4)(OH)4Cl6 · 2H2O (?) |
| 7.DF.60 | Evdokimovite | Tl4(VO)3(SO4)5(H2O)5 |
| 7.DF.62 | Bridgesite-(Ce) | CaCe2Cu6(SO4)4(OH)12 · 8H2O |
| 7.DF.65 | Elyite | Pb4Cu(SO4)O2(OH)4 · H2O |
| 7.DF.70 | Yecoraite | Fe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O |
| 7.DF.70 | Lautenthalite | PbCu4(SO4)2(OH)6 · 3H2O |
| 7.DF.75 | Riomarinaite | Bi(SO4)(OH) · H2O |
| 7.DF.80 | Dukeite | Bi3+24Cr6+8O57(OH)6 · 3H2O |
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 Peretaite
mindat.org URL:
https://www.mindat.org/min-3159.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Peretaite
Reference List:
Cipriani, Nicola, Menchetti, Silvio, Orlandi, Paolo, Sabelli, Cesare (1980) Peretaite, CaSb4O4(OH)2(SO4)2·2H2O, a new mineral from Pereta, Tuscany, Italy. American Mineralogist, 65 (9-10) 936-939
Menchetti, Silvio, Sabelli, Cesare (1980) Peretaite, CaSb4O4(OH)2(SO4)2·2H2O: its atomic arrangement and twinning. American Mineralogist, 65 (9-10) 940-946
Cipriani, Nicola, Menchetti, Silvio, Orlandi, Paolo, Sabelli, Cesare (1980) Peretaite, CaSb4O4(OH)2(SO4)2·2H2O, a new mineral from Pereta, Tuscany, Italy. American Mineralogist, 65 (9-10) 936-939
Localities for Peretaite
Showing 6 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.
Greece | |
| Skarpelis et al. (2009) |
Italy (TL) | |
| Cipriani et al. (1980) +1 other reference |
| Nannoni R. et al. (PI) +2 other references |
| Sabelli et al. (1984) +1 other reference |
Luxembourg | |
| Filella et al. (2009) |
Slovakia | |
| Majzlan et al. (2016) |
Quick NavTopAbout PeretaiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Pereta Mine, Scansano, Grosseto Province, Tuscany, Italy