Hackmanite

Where it forms, where it's found

20recorded occurrences

Source · OpenStreetMap

Physical

Colour: Pink · purple · blue · white · colourless

Optical

UV response: In hackmanite, green fluorescence is thought to be caused by partial substitution of Na+ by Mn, while partial substitution of Al3+ by Fe3+ leads to red luminescence and orange fluorescence is caused by the S2− . Ce3+ causes the fluorescence spectra to show an emission peak around 340 nm, Eu2+ leads to violet fluorescence, and the s2-type ions are associated with blue fluorescence, while the association of Ti3+ with oxygen vacancies may also lead to blue fluorescence.[[2]]

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 24 15.999 383.976
39.62%
11NaSodium Sodium 8 22.990 183.920
18.98%
14SiSilicon Silicon 6 28.085 168.510
17.39%
13AlAluminium Aluminium 6 26.982 161.892
16.70%
17ClChlorine Chlorine 2 35.450 70.900
7.31%
Total 969.198 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
8OOxygen	Oxygen	24	15.999	383.976	39.62%
11NaSodium	Sodium	8	22.990	183.920	18.98%
14SiSilicon	Silicon	6	28.085	168.510	17.39%
13AlAluminium	Aluminium	6	26.982	161.892	16.70%
17ClChlorine	Chlorine	2	35.450	70.900	7.31%
	Total	969.198	100.00%

Synonyms

Hackmanit
Hackmanita

Literature, links & citation

Citations

1901Borgström, L.H. (1901) Mineralogiska Notiser. 4. Hackmanit ett nytt mineral i sodalitgruppen. Geologiska Föreningen i Stockholm Förhandlingar: 23: 7: 563-566
1903Borgström, L.H. (1903) Hackmanit, ein neues Mineral der Sodalithgruppe. Zeitschrift für Kristallographie und Mineralogie: 37: 284-285.
1903Borgström, L.H. (1903) Uvarovite and Hackmanite. Journal of the Chemical Society: 84: 2: 304.
1936Lee, O. Ivan (1936) A new property of matter: Reversible photosensitivity in hackmanite from Bancroft, Ontario. American Mineralogist, 21 (12) 764-776
2013Goettlicher, Joerg, Kotelnikov, Alexey, Suk, Natalya, Kovalski, Andrey, Vitova, Tonya, Steininger, Ralph (2013) Sulfur K X-ray absorption near edge structure spectroscopy on the photochrome sodalite variety hackmanite.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Hackmanite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/hackmanite-1789},
  note      = {Accessed 2026-05-11}
}