Epistolite

Image

Colorless platy silky crystals of the very rare niobium mineral epistolite from the type locality in Greenland: Ilímaussaq, Narsaq, Kujalleq. Ex Vandenbroucke Museum collection from Waregem, Belgium.

© Photo by David Hospital, via Wikimedia Commons, CC-BY-SA-4.0

Properties

Formula (Na☐)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4
Abbreviation Epi
Luminescence emitter Ti
IMA Status Approved/redefined (IMA 2016 s.p.)
Search other databases webmineral.com, mindat.org, rruf.info, fluomin.org, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Hydroxide , Mineral, Silicate , Hydrated

Composition

Element Atoms
Si 4
Ti 1
☐ 1
O 22
Nb 2
H 10
Na 4
Total: 44

Reference

Reference Lines Spectra Images
Gaft et al. 1981; Khomiakov 1995 1 0 0