Peprossiite-(Y)

Where it forms, where it's found

Type locality: Dorozhniy pegmatite
Murghob
Gorno-Badakhshan
Tajikistan
38.3122°, 74.4106°

1recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Trigonal
Space group: #97
Cell parameters: a = 4.5872(2) Å · c = 9.2129(3) Å

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 10.67 15.999 170.709
47.09%
39YYttrium Yttrium 1 88.906 88.906
24.52%
13AlAluminium Aluminium 2 26.982 53.964
14.89%
5BBoron Boron 3.67 10.810 39.673
10.94%
14SiSilicon Silicon 0.33 28.085 9.268
2.56%
Total 362.520 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
8OOxygen	Oxygen	10.67	15.999	170.709	47.09%
39YYttrium	Yttrium	1	88.906	88.906	24.52%
13AlAluminium	Aluminium	2	26.982	53.964	14.89%
5BBoron	Boron	3.67	10.810	39.673	10.94%
14SiSilicon	Silicon	0.33	28.085	9.268	2.56%
	Total	362.520	100.00%

Synonyms

IMA2024-046
Peprossiiet-(Y)

In other languages

German: IMA 2024-046 · Peprossiit-(Y)

Classification

Strunz

10th ed.

6.CA.45

6BoratesClass
6.CTriboratesDivision
6.CANeso-triboratesGroup
6.CA.45Peprossiite-(Y)Species

Group, growth & confusion

1 mineral

Peprossiite-(Ce)CeAl₂(B_3.67Si_0.33)O_10.67
Mineral
—

Literature, links & citation

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Peprossiite-(Y) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/peprossiite-y-471487},
  note      = {Accessed 2026-05-11}
}