| Hoelite | |
|---|---|
 Yellow acicular crystals of hoelite (picture size: 10 mm) | |
| General | |
| Category | Organic mineral |
| Formula (repeating unit) | 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, discovered in 1922 at Mt. Pyramide, Spitsbergen, Norway and named after Norwegian geologist Adolf Hoel (1879–1964). Its chemical formula is C14H8O2 (9,10-anthraquinone).[2]
It is a very rare organic mineral which occurs in coal fire environments in association with sal ammoniac and native sulfur.[2]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Hoelite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America. Archived from the original (PDF) on 4 March 2016. Retrieved 12 September 2017.
- ^ Barthelmy, Dave. "Hoelite". Mindat.org. Retrieved 12 September 2017.