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Perettiite-(Y)

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Formula:
Y2Mn4FeSi2B8O24
System:
Orthorhombic
Colour:
Yellow
Hardness:
7
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.


Classification of Perettiite-(Y)

Approved
Approval Year:
2015

Physical Properties of Perettiite-(Y)

Colour:
Yellow
Hardness (Mohs):
7
Comment:
Estimated
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
4.533 g/cm3 (Calculated)

Chemical Properties of Perettiite-(Y)

Formula:
Y2Mn4FeSi2B8O24
Elements listed in formula:
Analytical Data:
The empirical formula using LA-ICP-MS data (based on 24 O pfu) (from type description). Calculation of the H2O content using IR absorption data yields a maximum hydroxyl/water content equivalent to 0.1 wt.% H2O.

Crystallography of Perettiite-(Y)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Space Group 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 Volume:
V 759.71 ų
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.63(52)
4.08(28)
3.05(100)
2.64(67)
2.54(60)
1.87(33)
1.84(52)
1.44(25)
Comments:
From Type Description.

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
Empirical Formula:
Y2.06Ln0.53Zr0.02Th0.01Mn3.24Ca0.38Fe0.71Mg0.07Al0.11Li0.22Si1.95B7.44Be0.31O24
Associated Minerals at Type Locality:

Other Names for Perettiite-(Y)

Name in Other Languages:

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.

References for Perettiite-(Y)

Reference List:
Danisi, R.M., Armbruster, T., Wang, H., Günther, D., Nagashima, M., Reusser, E. and Bieri, W. (2015) Perettiite-(Y), IMA 2014-109. CNMNC Newsletter No. 25, June 2015, page 533; Mineralogical Magazine, 79, 529-535.

Danisi, R.M., Armbruster, T., Libowitzky, E., Wang, Hao A.O., Günther, D. Nagashima, M. Reusser, E. and Bieri W. (2015): Perettiite-(Y), Y3+2Mn2+4Fe2+[Si2B8O24], a new mineral from Momeik, Myanmar. European Journal of Mineralogy, 27, 793-803.

Internet Links for Perettiite-(Y)

mindat.org URL:
https://www.mindat.org/min-46623.html
Please feel free to link to this page.

Localities for Perettiite-(Y)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Myanmar (TL)
 
  • Shan State
    • Kyaukme District
      • Momeik Township
        • Molo quarter
          • Khetchel village (Cache village; Khat Che village)
Danisi, R.M., Armbruster, T., Wang, H., Günther, D., Nagashima, M., Reusser, E. and Bieri, W. (2015) Perettiite-(Y), IMA 2014-109. CNMNC Newsletter No. 25, June 2015, page 533; Mineralogical Magazine, 79, 529-535. ; Danisi, R.M., Armbruster, T., Wang, H., Günther, D., Nagashima, M., Reusser, E. and Bieri, W. (2015) Perettiite-(Y), IMA 2014-109. CNMNC Newsletter No. 25, June 2015, page 533; Mineralogical Magazine, 79, 529-535. ; Danisi, R.M., Armbruster, T., Libowitzky, E., Wang, Hao A.O., Günther, D. Nagashima, M. Reusser, E. and Bieri W. (2015): Perettiite-(Y), Y3+2Mn2+4Fe2+[Si2B8O24], a new mineral from Momeik, Myanmar. European Journal of Mineralogy. 27: 793-803
Mineral and/or Locality  
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