Perettiite-(Y)
A valid IMA mineral species
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About Perettiite-(Y)
Formula:
Y2Mn4FeSi2B8O24
Colour:
Yellow
Hardness:
7
Specific Gravity:
4.533 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for Dr. Adolf Peretti, the mineral's discoverer, who is (as of 2015) head gemologist and director of GRS Gemresearch Swisslab AG (Adligenswil, Switzerland).
New structure type. The element combination is unique; other Y- & Fe-bearing borosilicate minerals are represented by laptevite-(Ce) and proshchenkoite-(Y), but their composition is more complex.
The structure contains: (1) two eight-coordinated sites: Y(Ln) and Mn2+(Ca,Y); (2) VI(Fe2+,Mg,Li) site; (3) Si2B8O24 (010) sheets formed by 4-, 5- and 8-membered rings ; in the interlayer space (between two of these sheets) the above sites occur. Boron is replaced by beryllium to a small extent.
The structure contains: (1) two eight-coordinated sites: Y(Ln) and Mn2+(Ca,Y); (2) VI(Fe2+,Mg,Li) site; (3) Si2B8O24 (010) sheets formed by 4-, 5- and 8-membered rings ; in the interlayer space (between two of these sheets) the above sites occur. Boron is replaced by beryllium to a small extent.
Unique Identifiers
Mindat ID:
46623
Long-form identifier:
mindat:1:1:46623:9
GUID
(UUID V4):
(UUID V4):
f14ec7b4-4db0-4467-8a2c-b4046c8b0eee
IMA Classification of Perettiite-(Y)
Classification of Perettiite-(Y)
9.EA.45
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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 |
|---|---|---|
| Ptt-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Perettiite-(Y)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Perettiite-(Y)
Colour:
Yellow
Hardness:
7 on Mohs scale
Comment:
Estimated
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
4.533 g/cm3 (Calculated)
Chemistry of Perettiite-(Y)
Mindat Formula:
Y2Mn4FeSi2B8O24
Crystallography of Perettiite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Setting:
Pmna
Cell Parameters:
a = 12.8252(5) Å, b = 4.6187(2) Å, c = 12.8252(5) Å
Ratio:
a:b:c = 2.777 : 1 : 2.777
Unit Cell V:
759.71 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.63 Å | (52) |
| 4.08 Å | (28) |
| 3.05 Å | (100) |
| 2.64 Å | (67) |
| 2.54 Å | (60) |
| 1.87 Å | (33) |
| 1.84 Å | (52) |
| 1.44 Å | (25) |
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 |
Type Occurrence of Perettiite-(Y)
General Appearance of Type Material:
Yellow needles enclosed in phenakite crystals.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museum of Natural History Bern, Bernastrasse 5, 3012 Bern, Switzerland, specimen number NMBE-43035
Geological Setting of Type Material:
Pegmatites
Associated Minerals at Type Locality:
Synonyms of Perettiite-(Y)
Common Associates
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Fluorapophyllite-(NH₄) | NH4Ca4(Si8O20)F · 8H2O |
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.07 | Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(Ce) | Na2CeSi6O14 · 6H2O |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
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 Perettiite-(Y)
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https://www.mindat.org/min-46623.html
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References for Perettiite-(Y)
Localities for Perettiite-(Y)
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.
Myanmar (TL) | |
| Mineralogical Magazine +5 other references |
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Phenakite Mine, Khetchel village, Molo quarter, Momeik Township, Kyaukme District, Shan State, Myanmar