Bertrandite

Image

Bertrandite crystals from Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal. Field of View: 5 mm.

© Photo by César Menor-Salván (via Wikimedia Commons), CC-BY 3.0

Properties

Formula Be4Si2O7(OH)2
Abbreviation Btd
Luminescence emitter O
IMA Status Grandfathered (pre-IMA), 1878
Search other databases webmineral.com, mindat.org, rruf.info, fluomin.org, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Crystal symmetry Orthorhombic, Point group mm2, Space group Cmc21 (#36)
Tags Mineral, Silicate , Hydroxide

Composition

Element Atoms
O 9
Si 2
H 2
Be 4
Total: 17

Reference

Reference Lines Spectra Images
Gorobets and Prokofiev 1981 1 0 0