Hoelite
Hoelite | |
---|---|
Yellow acicular crystals of Hoelite (picture size: 10 mm) | |
General | |
Category | Organic minerals |
Formula (repeating unit) | C14H8O2 |
Strunz classification | 10.CA.15 |
Dana classification | 50.4.2.1 |
Crystal system | Monoclinic |
Crystal class |
Prismatic (2/m) H-M symbol: (2/m) |
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][3]
It is a very rare organic mineral which occurs in coal fire environments in association with sal ammoniac and native sulfur.[1]
References
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