Hexacelsian

Ba(Al2Si2O8)
IMA status
  • Approved
IMA symbol
Hcls
IMA approved
2015
Also known as
  • IMA2015-045

Where it forms, where it's found

Geological setting

In veins of paralava cutting gehlenite-flamite hornfels located in the Gurim Anticline in the Negev Desert, Israel.

Type locality
Gurim anticline
  1. Hatrurim Basin
  2. Tamar Regional Council
  3. Beersheba Subdistrict
  4. Southern District
  5. Israel

31.1500°, 35.2833°

3recorded occurrences
Source · OpenStreetMap

Physical

Transparency
Transparent
Colour
Colorless
Streak
White
Cleavage
Very Good

on (0001)

Fracture
Irregular/Uneven
Density
3.305 g/cm³

Optical

Optical type
Uniaxial
Pleochroism
Non-pleochroic

Crystallography

Crystal system
Hexagonal
Space group
P63/mcm
Cell parameters
a = 5.292 Å · c = 15.557(2) Å
Type-locality form

In oval polymineralic inclusions in paralava, as elongate crystals <10 μm thick

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
56BaBariumBarium1137.327137.327
36.58%
8OOxygenOxygen815.999127.992
34.09%
14SiSiliconSilicon228.08556.170
14.96%
13AlAluminiumAluminium226.98253.964
14.37%
Total375.453100.00%

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

From IMA formula

Synonyms

  • IMA2015-045

In other languages

German
Hexacelsian · IMA 2015-045

Classification

Strunz
10th ed.

9.FA

  • 9SilicatesClass
  • 9.FTektosilicates without zeolitic H2ODivision
  • 9.FATektosilicates without additional non-tetrahedral anionsGroup
  • 9.FAHexacelsianSpecies

Group, growth & confusion

Commonly confused with
2 minerals

Literature, links & citation

Citations
  1. 1976Müller, W. F. (1976) On Polymorphism of BaAl2Si2O8. In Electron Microscopy in Mineralogy. Springer Berlin Heidelberg. p.354-360. doi:10.1007/978-3-642-66196-9_27DOI: 10.1007/978-3-642-66196-9_27
  2. 2015Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 27. Mineralogical Magazine, 79 (5). 1223-1230 doi:10.1180/minmag.2015.079.5.16DOI: 10.1180/minmag.2015.079.5.16
  3. 2017Galuskina, Irina O., Galuskin, Evgeny V., Vapnik, Yevgeny, Prusik, Krystian, Stasiak, Marta, Dzierżanowski, Piotr, Murashko, Mikhail (2017) Gurimite, Ba3(VO4)2 and hexacelsian, BaAl2Si2O8 – two new minerals from schorlomite-rich paralava of the Hatrurim Complex, Negev Desert, Israel. Mineralogical Magazine, 81 (4) 1009-1019 doi:10.1180/minmag.2016.080.147 DOI: 10.1180/minmag.2016.080.147
  4. 2018(2018) Hexacelsian. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Hexacelsian — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/hexacelsian-46796},
  note      = {Accessed 2026-05-11}
}