Hoelite

Hoelite
Yellow acicular crystals of Hoelite (picture size: 10 mm)
General
Category Organic mineral
Formula
(repeating unit)		 C14H8O2
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 [1][2]

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).[1]

It is a very rare organic mineral which occurs in coal fire environments in association with sal ammoniac and native sulfur.[1]

References

  1. 1 2 3 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.
  2. ↑ Barthelmy, Dave. "Hoelite". Mindat.org. Retrieved 12 September 2017.


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