Hoelite
Appearance
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]
References
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Wikimedia Commons has media related to Hoelite.
- ^ 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. Retrieved 12 September 2017.
- ^ Barthelmy, Dave. "Hoelite". Mindat.org. Retrieved 12 September 2017.