Imperial Topaz

Al2(SiO4)(F,OH)2
Variety of
Topaz
TopazAl2SiO4F2

Where it forms, where it's found

5recorded occurrences
Source · OpenStreetMap

Physical

Colour
Golden yellow · orange · pink · red · purple

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen615.99995.994
44.02%
13AlAluminiumAluminium226.98253.964
24.75%
9FFluorineFluorine218.99837.996
17.43%
14SiSiliconSilicon128.08528.085
12.88%
1HHydrogenHydrogen21.0082.016
0.92%
Total218.055100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From Mindat formula

Literature, links & citation

Citations
  1. 2013www.gia.edu (n.d.) https://www.gia.edu/gia-faq-imperial-topaz
  2. 2014www.gia.edu (n.d.) https://www.gia.edu/topaz-history-lore
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Imperial Topaz — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/imperial-topaz-8110},
  note      = {Accessed 2026-05-11}
}