Oxy-dravite-1A

Na(Mg2Al)Al6(Si6O18)(BO3)3(OH)3O
Variety ofOxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O

Where it forms, where it's found

Type locality
Bald Hornet Prospect
  1. Snoqualmie Mining District
  2. King County
  3. Washington
  4. USA

47.5123°, -121.7047°

1recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Triclinic

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen3115.999495.969
51.64%
13AlAluminiumAluminium726.982188.874
19.67%
14SiSiliconSilicon628.085168.510
17.55%
12MgMagnesiumMagnesium224.30548.610
5.06%
5BBoronBoron310.81032.430
3.38%
11NaSodiumSodium122.99022.990
2.39%
1HHydrogenHydrogen31.0083.024
0.31%
Total960.407100.00%

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

From Mindat formula

Literature, links & citation

Citations
  1. 2022Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65. European Journal of Mineralogy, 34 (1) 143-148 doi:10.5194/ejm-34-143-2022 DOI: 10.5194/ejm-34-143-2022
  2. 2022Bosi, Ferdinando, Skogby, Henrik, Hålenius, Ulf, Ciriotti, Marco E., Mills, Stuart J. (2022) Lowering R3m Symmetry in Mg-Fe-Tourmalines: The Crystal Structures of Triclinic Schorl and Oxy-Dravite, and the Mineral luinaite-(OH) Discredited. Minerals, 12 (4) 430 doi:10.3390/min12040430 DOI: 10.3390/min12040430
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Oxy-dravite-1A — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/oxy-dravite-1a-471321},
  note      = {Accessed 2026-05-11}
}