Where it forms, where it's found
- Geological setting
Late-stage product in the core of the Poudrette Pegmatite.
- Type locality
- Poudrette quarry (De-Mix quarry
- Demix quarry
- Uni-Mix quarry
- Carrière Mont Saint-Hilaire
- MSH)
- Mont Saint-Hilaire
- La Vallée-du-Richelieu RCM
- Montérégie
- Québec
- Canada
45.5628°, -73.1417°
2recorded occurrences
Physical
Optical
- Refractive index
- 1.601
- Surface relief
- Moderate
- Principal indices
- nβ 1.601
- Birefringence
- Very low (~100)
- Extinction
- Exhibit parallel extinction
- UV response
- Shows no discernible fluorescence under long-, medium-, or short-wave ultraviolet radiation.
Crystallography
- Space group
- P2 2 2
- Cell parameters
- a = 11.167(2) Å · b = 11.164(2) Å · c = 11.162(1) Å
- Ratio a:b:c
- 1 : 1.000 : 1.000
- Morphology
Pinacoid (100), (010), and (001) and the minor forms rhombic prism (110), (101), and (011).
- Epitaxy
As crystals (pseudocubes) with yellowish-white cores of ramikite-(Y) and thin (< 50 um) pale pink rims of peatite-(Y).
- Type-locality form
Epitactic-like, euhedral crystals (pseudocubes) of peatite-(Y) and ramikite-(Y) range from 0.1 to 1 mm in size (average: 0.2 mm). Core = ramikite-(Y) and peatite-(Y) as thin (< 50 µm) pale pink rims.
Crystal structure
Synonyms
- IMA2009-020
- Peatiet-(Y)
In other languages
- German
- IMA 2009-020 · Peatit-(Y)
- Italian
- peatite-(Y)
Classification
Strunz
10th ed.5.BF.45
- 5CarbonatesClass
- 5.BCarbonates with additional anions, without H2ODivision
- 5.BFWith (Cl), SO4, PO4, TeO3Group
- 5.BF.45Peatite-(Y)Species
Dana
8th ed.43.04.14
- 43Compound Phosphates, Etc.Class
- 43.04Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or HalogenType
- 43.04.14— unnamed intermediate level —Group
- 43.04.14Peatite-(Y)Species
Literature, links & citation
Citations
- 2013McDonald, Andrew M., Back, Malcolm E., Gault, Robert A., Horváth, László (2013) Peatite-(Y) and ramikite-(Y), two new Na-Li-Y±Zr phosphate-carbonate minerals from the Poudrette pegmatite, Mont Saint-Hilaire, Quebec. The Canadian Mineralogist, 51 (4) 569-596 doi:10.3749/canmin.51.4.569DOI: 10.3749/canmin.51.4.569
- 2015(2015) Peatite-(Y). Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Peatite-(Y) — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/peatite-y-39554},
note = {Accessed 2026-05-11}
}