# Hoelite

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Mineral

Hoelite Yellow acicular crystals of hoelite (picture size: 10 mm) General Category Organic mineral Formula C14H8O2 IMA symbol Hoe[1] Strunz classification 10.CA.15 Dana classification 50.4.2.1 Crystal system Monoclinic Crystal class Prismatic (2/m) (same H-M symbol) Space group P21/a Unit cell a = 15.81 Å, b = 3.967 Å c = 7.876 Å; β = 102.67°; Z = 2 Identification Color Yellow, yellowish green Crystal habit Acicular clusters; pseudo-orthorhombic Cleavage Good Streak Light yellow Diaphaneity Semitransparent Specific gravity 1.42 Optical properties Biaxial (+) Refractive index nα≈1.75, nβ≈1.75, nγ≈2.0 References [2][3]

**Hoelite** is a [mineral](/source/Mineral), discovered in 1922 at Mt. Pyramide, [Spitsbergen](/source/Spitsbergen), Norway and named after Norwegian geologist [Adolf Hoel](/source/Adolf_Hoel) (1879–1964). Its chemical formula is C14H8O2 ([9,10-anthraquinone](/source/9%2C10-anthraquinone)).[2]

It is a very rare [organic mineral](/source/Organic_mineral) which occurs in [coal fire](/source/Coal-seam_fire) environments in association with [sal ammoniac](/source/Sal_ammoniac) and [native sulfur](/source/Native_sulfur).[2]

## References

Wikimedia Commons has media related to [Hoelite](https://commons.wikimedia.org/wiki/Category:Hoelite).

1. **[^](#cite_ref-1)** Warr, L.N. (2021). ["IMA–CNMNC approved mineral symbols"](https://doi.org/10.1180%2Fmgm.2021.43). *Mineralogical Magazine*. **85** (3): 291–320. [Bibcode](/source/Bibcode_(identifier)):[2021MinM...85..291W](https://ui.adsabs.harvard.edu/abs/2021MinM...85..291W). [doi](/source/Doi_(identifier)):[10.1180/mgm.2021.43](https://doi.org/10.1180%2Fmgm.2021.43). [S2CID](/source/S2CID_(identifier)) [235729616](https://api.semanticscholar.org/CorpusID:235729616).

1. ^ [***a***](#cite_ref-HBM_2-0) [***b***](#cite_ref-HBM_2-1) [***c***](#cite_ref-HBM_2-2) Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). ["Hoelite"](https://web.archive.org/web/20160304061756/http://www.handbookofmineralogy.com/pdfs/hoelite.pdf) (PDF). *Handbook of Mineralogy*. Chantilly, VA: Mineralogical Society of America. Archived from [the original](http://www.handbookofmineralogy.com/pdfs/hoelite.pdf) (PDF) on 4 March 2016. Retrieved 12 September 2017.

1. **[^](#cite_ref-Mindat_3-0)** Barthelmy, Dave. ["Hoelite"](https://www.mindat.org/min-1915.html). Mindat.org. Retrieved 12 September 2017.

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