Alkali-beryl

Where it forms, where it's found

11recorded occurrences

Source · OpenStreetMap

Varieties

Caesium BerylBe₃Al₂(Si₆O₁₈)
Variety
—

Safety & handling

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 18 15.999 287.982
53.58%
14SiSilicon Silicon 6 28.085 168.510
31.35%
13AlAluminium Aluminium 2 26.982 53.964
10.04%
4BeBeryllium Beryllium 3 9.012 27.036
5.03%
Total 537.492 100.00%
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	18	15.999	287.982	53.58%
14SiSilicon	Silicon	6	28.085	168.510	31.35%
13AlAluminium	Aluminium	2	26.982	53.964	10.04%
4BeBeryllium	Beryllium	3	9.012	27.036	5.03%
	Total	537.492	100.00%

Synonyms

Béryl riche en alcalis
Soda-Beryl

Literature, links & citation

Citations

1960Matsuda, Shunji (1960) Alkali Elements in Beryl. Journal of the Mineralogical Society of Japan, 4 (5) 398-403 doi:10.2465/gkk1952.4.398 DOI: 10.2465/gkk1952.4.398
1976Černý, P., Hawthorne, F.C. (1976) Refractive indices versus alkali contents in beryl: General limitations and applications to some pegmatitic types. The Canadian Mineralogist: 14: 491-497.
1999Sarbajna, Chanchal; Sinha, R. P.; Krishnamurthy, P.; Krishna, K. V. G.; Viswanathan, R.; Banerjee, D. C. (1999) Mineralogy and Geochemistry of Alkali Beryl from the Rare Metal Bearing Pegmatites of Marlagalla-Allapatna, Mandya District, Karnataka. Journal Geological Society of India, 54 (6). 599-608 doi:10.17491/jgsi/1999/540603DOI: 10.17491/jgsi/1999/540603
2009Yakubovich, O. V., Pekov, I. V., Steele, I. M., Massa, W., Chukanov, N. V. (2009) Alkali metals in beryl and their role in the formation of derivative structural motifs: Comparative crystal chemistry of vorobyevite and pezzottaite. Crystallography Reports, 54 (3) 399-412 doi:10.1134/s1063774509030067DOI: 10.1134/s1063774509030067
2018Pezzotta, Federico, Vignola, Pietro (2018) Tabular blue alkali beryl from Italy and Afghanistan. The Mineralogical Record, 49 (4) 563-572

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Alkali-beryl — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/alkali-beryl-120},
  note      = {Accessed 2026-05-11}
}